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diff --git a/Documentation/laptops/thinkpad-acpi.txt b/Documentation/laptops/thinkpad-acpi.txt deleted file mode 100644 index 6cced88de6da..000000000000 --- a/Documentation/laptops/thinkpad-acpi.txt +++ /dev/null @@ -1,1487 +0,0 @@ - ThinkPad ACPI Extras Driver - - Version 0.25 - October 16th, 2013 - - Borislav Deianov <borislav@users.sf.net> - Henrique de Moraes Holschuh <hmh@hmh.eng.br> - http://ibm-acpi.sf.net/ - - -This is a Linux driver for the IBM and Lenovo ThinkPad laptops. It -supports various features of these laptops which are accessible -through the ACPI and ACPI EC framework, but not otherwise fully -supported by the generic Linux ACPI drivers. - -This driver used to be named ibm-acpi until kernel 2.6.21 and release -0.13-20070314. It used to be in the drivers/acpi tree, but it was -moved to the drivers/misc tree and renamed to thinkpad-acpi for kernel -2.6.22, and release 0.14. It was moved to drivers/platform/x86 for -kernel 2.6.29 and release 0.22. - -The driver is named "thinkpad-acpi". In some places, like module -names and log messages, "thinkpad_acpi" is used because of userspace -issues. - -"tpacpi" is used as a shorthand where "thinkpad-acpi" would be too -long due to length limitations on some Linux kernel versions. - -Status ------- - -The features currently supported are the following (see below for -detailed description): - - - Fn key combinations - - Bluetooth enable and disable - - video output switching, expansion control - - ThinkLight on and off - - CMOS/UCMS control - - LED control - - ACPI sounds - - temperature sensors - - Experimental: embedded controller register dump - - LCD brightness control - - Volume control - - Fan control and monitoring: fan speed, fan enable/disable - - WAN enable and disable - - UWB enable and disable - -A compatibility table by model and feature is maintained on the web -site, http://ibm-acpi.sf.net/. I appreciate any success or failure -reports, especially if they add to or correct the compatibility table. -Please include the following information in your report: - - - ThinkPad model name - - a copy of your ACPI tables, using the "acpidump" utility - - a copy of the output of dmidecode, with serial numbers - and UUIDs masked off - - which driver features work and which don't - - the observed behavior of non-working features - -Any other comments or patches are also more than welcome. - - -Installation ------------- - -If you are compiling this driver as included in the Linux kernel -sources, look for the CONFIG_THINKPAD_ACPI Kconfig option. -It is located on the menu path: "Device Drivers" -> "X86 Platform -Specific Device Drivers" -> "ThinkPad ACPI Laptop Extras". - - -Features --------- - -The driver exports two different interfaces to userspace, which can be -used to access the features it provides. One is a legacy procfs-based -interface, which will be removed at some time in the future. The other -is a new sysfs-based interface which is not complete yet. - -The procfs interface creates the /proc/acpi/ibm directory. There is a -file under that directory for each feature it supports. The procfs -interface is mostly frozen, and will change very little if at all: it -will not be extended to add any new functionality in the driver, instead -all new functionality will be implemented on the sysfs interface. - -The sysfs interface tries to blend in the generic Linux sysfs subsystems -and classes as much as possible. Since some of these subsystems are not -yet ready or stabilized, it is expected that this interface will change, -and any and all userspace programs must deal with it. - - -Notes about the sysfs interface: - -Unlike what was done with the procfs interface, correctness when talking -to the sysfs interfaces will be enforced, as will correctness in the -thinkpad-acpi's implementation of sysfs interfaces. - -Also, any bugs in the thinkpad-acpi sysfs driver code or in the -thinkpad-acpi's implementation of the sysfs interfaces will be fixed for -maximum correctness, even if that means changing an interface in -non-compatible ways. As these interfaces mature both in the kernel and -in thinkpad-acpi, such changes should become quite rare. - -Applications interfacing to the thinkpad-acpi sysfs interfaces must -follow all sysfs guidelines and correctly process all errors (the sysfs -interface makes extensive use of errors). File descriptors and open / -close operations to the sysfs inodes must also be properly implemented. - -The version of thinkpad-acpi's sysfs interface is exported by the driver -as a driver attribute (see below). - -Sysfs driver attributes are on the driver's sysfs attribute space, -for 2.6.23+ this is /sys/bus/platform/drivers/thinkpad_acpi/ and -/sys/bus/platform/drivers/thinkpad_hwmon/ - -Sysfs device attributes are on the thinkpad_acpi device sysfs attribute -space, for 2.6.23+ this is /sys/devices/platform/thinkpad_acpi/. - -Sysfs device attributes for the sensors and fan are on the -thinkpad_hwmon device's sysfs attribute space, but you should locate it -looking for a hwmon device with the name attribute of "thinkpad", or -better yet, through libsensors. For 4.14+ sysfs attributes were moved to the -hwmon device (/sys/bus/platform/devices/thinkpad_hwmon/hwmon/hwmon? or -/sys/class/hwmon/hwmon?). - -Driver version --------------- - -procfs: /proc/acpi/ibm/driver -sysfs driver attribute: version - -The driver name and version. No commands can be written to this file. - - -Sysfs interface version ------------------------ - -sysfs driver attribute: interface_version - -Version of the thinkpad-acpi sysfs interface, as an unsigned long -(output in hex format: 0xAAAABBCC), where: - AAAA - major revision - BB - minor revision - CC - bugfix revision - -The sysfs interface version changelog for the driver can be found at the -end of this document. Changes to the sysfs interface done by the kernel -subsystems are not documented here, nor are they tracked by this -attribute. - -Changes to the thinkpad-acpi sysfs interface are only considered -non-experimental when they are submitted to Linux mainline, at which -point the changes in this interface are documented and interface_version -may be updated. If you are using any thinkpad-acpi features not yet -sent to mainline for merging, you do so on your own risk: these features -may disappear, or be implemented in a different and incompatible way by -the time they are merged in Linux mainline. - -Changes that are backwards-compatible by nature (e.g. the addition of -attributes that do not change the way the other attributes work) do not -always warrant an update of interface_version. Therefore, one must -expect that an attribute might not be there, and deal with it properly -(an attribute not being there *is* a valid way to make it clear that a -feature is not available in sysfs). - - -Hot keys --------- - -procfs: /proc/acpi/ibm/hotkey -sysfs device attribute: hotkey_* - -In a ThinkPad, the ACPI HKEY handler is responsible for communicating -some important events and also keyboard hot key presses to the operating -system. Enabling the hotkey functionality of thinkpad-acpi signals the -firmware that such a driver is present, and modifies how the ThinkPad -firmware will behave in many situations. - -The driver enables the HKEY ("hot key") event reporting automatically -when loaded, and disables it when it is removed. - -The driver will report HKEY events in the following format: - - ibm/hotkey HKEY 00000080 0000xxxx - -Some of these events refer to hot key presses, but not all of them. - -The driver will generate events over the input layer for hot keys and -radio switches, and over the ACPI netlink layer for other events. The -input layer support accepts the standard IOCTLs to remap the keycodes -assigned to each hot key. - -The hot key bit mask allows some control over which hot keys generate -events. If a key is "masked" (bit set to 0 in the mask), the firmware -will handle it. If it is "unmasked", it signals the firmware that -thinkpad-acpi would prefer to handle it, if the firmware would be so -kind to allow it (and it often doesn't!). - -Not all bits in the mask can be modified. Not all bits that can be -modified do anything. Not all hot keys can be individually controlled -by the mask. Some models do not support the mask at all. The behaviour -of the mask is, therefore, highly dependent on the ThinkPad model. - -The driver will filter out any unmasked hotkeys, so even if the firmware -doesn't allow disabling an specific hotkey, the driver will not report -events for unmasked hotkeys. - -Note that unmasking some keys prevents their default behavior. For -example, if Fn+F5 is unmasked, that key will no longer enable/disable -Bluetooth by itself in firmware. - -Note also that not all Fn key combinations are supported through ACPI -depending on the ThinkPad model and firmware version. On those -ThinkPads, it is still possible to support some extra hotkeys by -polling the "CMOS NVRAM" at least 10 times per second. The driver -attempts to enables this functionality automatically when required. - -procfs notes: - -The following commands can be written to the /proc/acpi/ibm/hotkey file: - - echo 0xffffffff > /proc/acpi/ibm/hotkey -- enable all hot keys - echo 0 > /proc/acpi/ibm/hotkey -- disable all possible hot keys - ... any other 8-hex-digit mask ... - echo reset > /proc/acpi/ibm/hotkey -- restore the recommended mask - -The following commands have been deprecated and will cause the kernel -to log a warning: - - echo enable > /proc/acpi/ibm/hotkey -- does nothing - echo disable > /proc/acpi/ibm/hotkey -- returns an error - -The procfs interface does not support NVRAM polling control. So as to -maintain maximum bug-to-bug compatibility, it does not report any masks, -nor does it allow one to manipulate the hot key mask when the firmware -does not support masks at all, even if NVRAM polling is in use. - -sysfs notes: - - hotkey_bios_enabled: - DEPRECATED, WILL BE REMOVED SOON. - - Returns 0. - - hotkey_bios_mask: - DEPRECATED, DON'T USE, WILL BE REMOVED IN THE FUTURE. - - Returns the hot keys mask when thinkpad-acpi was loaded. - Upon module unload, the hot keys mask will be restored - to this value. This is always 0x80c, because those are - the hotkeys that were supported by ancient firmware - without mask support. - - hotkey_enable: - DEPRECATED, WILL BE REMOVED SOON. - - 0: returns -EPERM - 1: does nothing - - hotkey_mask: - bit mask to enable reporting (and depending on - the firmware, ACPI event generation) for each hot key - (see above). Returns the current status of the hot keys - mask, and allows one to modify it. - - hotkey_all_mask: - bit mask that should enable event reporting for all - supported hot keys, when echoed to hotkey_mask above. - Unless you know which events need to be handled - passively (because the firmware *will* handle them - anyway), do *not* use hotkey_all_mask. Use - hotkey_recommended_mask, instead. You have been warned. - - hotkey_recommended_mask: - bit mask that should enable event reporting for all - supported hot keys, except those which are always - handled by the firmware anyway. Echo it to - hotkey_mask above, to use. This is the default mask - used by the driver. - - hotkey_source_mask: - bit mask that selects which hot keys will the driver - poll the NVRAM for. This is auto-detected by the driver - based on the capabilities reported by the ACPI firmware, - but it can be overridden at runtime. - - Hot keys whose bits are set in hotkey_source_mask are - polled for in NVRAM, and reported as hotkey events if - enabled in hotkey_mask. Only a few hot keys are - available through CMOS NVRAM polling. - - Warning: when in NVRAM mode, the volume up/down/mute - keys are synthesized according to changes in the mixer, - which uses a single volume up or volume down hotkey - press to unmute, as per the ThinkPad volume mixer user - interface. When in ACPI event mode, volume up/down/mute - events are reported by the firmware and can behave - differently (and that behaviour changes with firmware - version -- not just with firmware models -- as well as - OSI(Linux) state). - - hotkey_poll_freq: - frequency in Hz for hot key polling. It must be between - 0 and 25 Hz. Polling is only carried out when strictly - needed. - - Setting hotkey_poll_freq to zero disables polling, and - will cause hot key presses that require NVRAM polling - to never be reported. - - Setting hotkey_poll_freq too low may cause repeated - pressings of the same hot key to be misreported as a - single key press, or to not even be detected at all. - The recommended polling frequency is 10Hz. - - hotkey_radio_sw: - If the ThinkPad has a hardware radio switch, this - attribute will read 0 if the switch is in the "radios - disabled" position, and 1 if the switch is in the - "radios enabled" position. - - This attribute has poll()/select() support. - - hotkey_tablet_mode: - If the ThinkPad has tablet capabilities, this attribute - will read 0 if the ThinkPad is in normal mode, and - 1 if the ThinkPad is in tablet mode. - - This attribute has poll()/select() support. - - wakeup_reason: - Set to 1 if the system is waking up because the user - requested a bay ejection. Set to 2 if the system is - waking up because the user requested the system to - undock. Set to zero for normal wake-ups or wake-ups - due to unknown reasons. - - This attribute has poll()/select() support. - - wakeup_hotunplug_complete: - Set to 1 if the system was waken up because of an - undock or bay ejection request, and that request - was successfully completed. At this point, it might - be useful to send the system back to sleep, at the - user's choice. Refer to HKEY events 0x4003 and - 0x3003, below. - - This attribute has poll()/select() support. - -input layer notes: - -A Hot key is mapped to a single input layer EV_KEY event, possibly -followed by an EV_MSC MSC_SCAN event that shall contain that key's scan -code. An EV_SYN event will always be generated to mark the end of the -event block. - -Do not use the EV_MSC MSC_SCAN events to process keys. They are to be -used as a helper to remap keys, only. They are particularly useful when -remapping KEY_UNKNOWN keys. - -The events are available in an input device, with the following id: - - Bus: BUS_HOST - vendor: 0x1014 (PCI_VENDOR_ID_IBM) or - 0x17aa (PCI_VENDOR_ID_LENOVO) - product: 0x5054 ("TP") - version: 0x4101 - -The version will have its LSB incremented if the keymap changes in a -backwards-compatible way. The MSB shall always be 0x41 for this input -device. If the MSB is not 0x41, do not use the device as described in -this section, as it is either something else (e.g. another input device -exported by a thinkpad driver, such as HDAPS) or its functionality has -been changed in a non-backwards compatible way. - -Adding other event types for other functionalities shall be considered a -backwards-compatible change for this input device. - -Thinkpad-acpi Hot Key event map (version 0x4101): - -ACPI Scan -event code Key Notes - -0x1001 0x00 FN+F1 - - -0x1002 0x01 FN+F2 IBM: battery (rare) - Lenovo: Screen lock - -0x1003 0x02 FN+F3 Many IBM models always report - this hot key, even with hot keys - disabled or with Fn+F3 masked - off - IBM: screen lock, often turns - off the ThinkLight as side-effect - Lenovo: battery - -0x1004 0x03 FN+F4 Sleep button (ACPI sleep button - semantics, i.e. sleep-to-RAM). - It always generates some kind - of event, either the hot key - event or an ACPI sleep button - event. The firmware may - refuse to generate further FN+F4 - key presses until a S3 or S4 ACPI - sleep cycle is performed or some - time passes. - -0x1005 0x04 FN+F5 Radio. Enables/disables - the internal Bluetooth hardware - and W-WAN card if left in control - of the firmware. Does not affect - the WLAN card. - Should be used to turn on/off all - radios (Bluetooth+W-WAN+WLAN), - really. - -0x1006 0x05 FN+F6 - - -0x1007 0x06 FN+F7 Video output cycle. - Do you feel lucky today? - -0x1008 0x07 FN+F8 IBM: toggle screen expand - Lenovo: configure UltraNav, - or toggle screen expand - -0x1009 0x08 FN+F9 - - .. .. .. -0x100B 0x0A FN+F11 - - -0x100C 0x0B FN+F12 Sleep to disk. You are always - supposed to handle it yourself, - either through the ACPI event, - or through a hotkey event. - The firmware may refuse to - generate further FN+F12 key - press events until a S3 or S4 - ACPI sleep cycle is performed, - or some time passes. - -0x100D 0x0C FN+BACKSPACE - -0x100E 0x0D FN+INSERT - -0x100F 0x0E FN+DELETE - - -0x1010 0x0F FN+HOME Brightness up. This key is - always handled by the firmware - in IBM ThinkPads, even when - unmasked. Just leave it alone. - For Lenovo ThinkPads with a new - BIOS, it has to be handled either - by the ACPI OSI, or by userspace. - The driver does the right thing, - never mess with this. -0x1011 0x10 FN+END Brightness down. See brightness - up for details. - -0x1012 0x11 FN+PGUP ThinkLight toggle. This key is - always handled by the firmware, - even when unmasked. - -0x1013 0x12 FN+PGDOWN - - -0x1014 0x13 FN+SPACE Zoom key - -0x1015 0x14 VOLUME UP Internal mixer volume up. This - key is always handled by the - firmware, even when unmasked. - NOTE: Lenovo seems to be changing - this. -0x1016 0x15 VOLUME DOWN Internal mixer volume up. This - key is always handled by the - firmware, even when unmasked. - NOTE: Lenovo seems to be changing - this. -0x1017 0x16 MUTE Mute internal mixer. This - key is always handled by the - firmware, even when unmasked. - -0x1018 0x17 THINKPAD ThinkPad/Access IBM/Lenovo key - -0x1019 0x18 unknown -.. .. .. -0x1020 0x1F unknown - -The ThinkPad firmware does not allow one to differentiate when most hot -keys are pressed or released (either that, or we don't know how to, yet). -For these keys, the driver generates a set of events for a key press and -immediately issues the same set of events for a key release. It is -unknown by the driver if the ThinkPad firmware triggered these events on -hot key press or release, but the firmware will do it for either one, not -both. - -If a key is mapped to KEY_RESERVED, it generates no input events at all. -If a key is mapped to KEY_UNKNOWN, it generates an input event that -includes an scan code. If a key is mapped to anything else, it will -generate input device EV_KEY events. - -In addition to the EV_KEY events, thinkpad-acpi may also issue EV_SW -events for switches: - -SW_RFKILL_ALL T60 and later hardware rfkill rocker switch -SW_TABLET_MODE Tablet ThinkPads HKEY events 0x5009 and 0x500A - -Non hotkey ACPI HKEY event map: -------------------------------- - -Events that are never propagated by the driver: - -0x2304 System is waking up from suspend to undock -0x2305 System is waking up from suspend to eject bay -0x2404 System is waking up from hibernation to undock -0x2405 System is waking up from hibernation to eject bay -0x5001 Lid closed -0x5002 Lid opened -0x5009 Tablet swivel: switched to tablet mode -0x500A Tablet swivel: switched to normal mode -0x5010 Brightness level changed/control event -0x6000 KEYBOARD: Numlock key pressed -0x6005 KEYBOARD: Fn key pressed (TO BE VERIFIED) -0x7000 Radio Switch may have changed state - - -Events that are propagated by the driver to userspace: - -0x2313 ALARM: System is waking up from suspend because - the battery is nearly empty -0x2413 ALARM: System is waking up from hibernation because - the battery is nearly empty -0x3003 Bay ejection (see 0x2x05) complete, can sleep again -0x3006 Bay hotplug request (hint to power up SATA link when - the optical drive tray is ejected) -0x4003 Undocked (see 0x2x04), can sleep again -0x4010 Docked into hotplug port replicator (non-ACPI dock) -0x4011 Undocked from hotplug port replicator (non-ACPI dock) -0x500B Tablet pen inserted into its storage bay -0x500C Tablet pen removed from its storage bay -0x6011 ALARM: battery is too hot -0x6012 ALARM: battery is extremely hot -0x6021 ALARM: a sensor is too hot -0x6022 ALARM: a sensor is extremely hot -0x6030 System thermal table changed -0x6032 Thermal Control command set completion (DYTC, Windows) -0x6040 Nvidia Optimus/AC adapter related (TO BE VERIFIED) -0x60C0 X1 Yoga 2016, Tablet mode status changed -0x60F0 Thermal Transformation changed (GMTS, Windows) - -Battery nearly empty alarms are a last resort attempt to get the -operating system to hibernate or shutdown cleanly (0x2313), or shutdown -cleanly (0x2413) before power is lost. They must be acted upon, as the -wake up caused by the firmware will have negated most safety nets... - -When any of the "too hot" alarms happen, according to Lenovo the user -should suspend or hibernate the laptop (and in the case of battery -alarms, unplug the AC adapter) to let it cool down. These alarms do -signal that something is wrong, they should never happen on normal -operating conditions. - -The "extremely hot" alarms are emergencies. According to Lenovo, the -operating system is to force either an immediate suspend or hibernate -cycle, or a system shutdown. Obviously, something is very wrong if this -happens. - - -Brightness hotkey notes: - -Don't mess with the brightness hotkeys in a Thinkpad. If you want -notifications for OSD, use the sysfs backlight class event support. - -The driver will issue KEY_BRIGHTNESS_UP and KEY_BRIGHTNESS_DOWN events -automatically for the cases were userspace has to do something to -implement brightness changes. When you override these events, you will -either fail to handle properly the ThinkPads that require explicit -action to change backlight brightness, or the ThinkPads that require -that no action be taken to work properly. - - -Bluetooth ---------- - -procfs: /proc/acpi/ibm/bluetooth -sysfs device attribute: bluetooth_enable (deprecated) -sysfs rfkill class: switch "tpacpi_bluetooth_sw" - -This feature shows the presence and current state of a ThinkPad -Bluetooth device in the internal ThinkPad CDC slot. - -If the ThinkPad supports it, the Bluetooth state is stored in NVRAM, -so it is kept across reboots and power-off. - -Procfs notes: - -If Bluetooth is installed, the following commands can be used: - - echo enable > /proc/acpi/ibm/bluetooth - echo disable > /proc/acpi/ibm/bluetooth - -Sysfs notes: - - If the Bluetooth CDC card is installed, it can be enabled / - disabled through the "bluetooth_enable" thinkpad-acpi device - attribute, and its current status can also be queried. - - enable: - 0: disables Bluetooth / Bluetooth is disabled - 1: enables Bluetooth / Bluetooth is enabled. - - Note: this interface has been superseded by the generic rfkill - class. It has been deprecated, and it will be removed in year - 2010. - - rfkill controller switch "tpacpi_bluetooth_sw": refer to - Documentation/rfkill.txt for details. - - -Video output control -- /proc/acpi/ibm/video --------------------------------------------- - -This feature allows control over the devices used for video output - -LCD, CRT or DVI (if available). The following commands are available: - - echo lcd_enable > /proc/acpi/ibm/video - echo lcd_disable > /proc/acpi/ibm/video - echo crt_enable > /proc/acpi/ibm/video - echo crt_disable > /proc/acpi/ibm/video - echo dvi_enable > /proc/acpi/ibm/video - echo dvi_disable > /proc/acpi/ibm/video - echo auto_enable > /proc/acpi/ibm/video - echo auto_disable > /proc/acpi/ibm/video - echo expand_toggle > /proc/acpi/ibm/video - echo video_switch > /proc/acpi/ibm/video - -NOTE: Access to this feature is restricted to processes owning the -CAP_SYS_ADMIN capability for safety reasons, as it can interact badly -enough with some versions of X.org to crash it. - -Each video output device can be enabled or disabled individually. -Reading /proc/acpi/ibm/video shows the status of each device. - -Automatic video switching can be enabled or disabled. When automatic -video switching is enabled, certain events (e.g. opening the lid, -docking or undocking) cause the video output device to change -automatically. While this can be useful, it also causes flickering -and, on the X40, video corruption. By disabling automatic switching, -the flickering or video corruption can be avoided. - -The video_switch command cycles through the available video outputs -(it simulates the behavior of Fn-F7). - -Video expansion can be toggled through this feature. This controls -whether the display is expanded to fill the entire LCD screen when a -mode with less than full resolution is used. Note that the current -video expansion status cannot be determined through this feature. - -Note that on many models (particularly those using Radeon graphics -chips) the X driver configures the video card in a way which prevents -Fn-F7 from working. This also disables the video output switching -features of this driver, as it uses the same ACPI methods as -Fn-F7. Video switching on the console should still work. - -UPDATE: refer to https://bugs.freedesktop.org/show_bug.cgi?id=2000 - - -ThinkLight control ------------------- - -procfs: /proc/acpi/ibm/light -sysfs attributes: as per LED class, for the "tpacpi::thinklight" LED - -procfs notes: - -The ThinkLight status can be read and set through the procfs interface. A -few models which do not make the status available will show the ThinkLight -status as "unknown". The available commands are: - - echo on > /proc/acpi/ibm/light - echo off > /proc/acpi/ibm/light - -sysfs notes: - -The ThinkLight sysfs interface is documented by the LED class -documentation, in Documentation/leds/leds-class.txt. The ThinkLight LED name -is "tpacpi::thinklight". - -Due to limitations in the sysfs LED class, if the status of the ThinkLight -cannot be read or if it is unknown, thinkpad-acpi will report it as "off". -It is impossible to know if the status returned through sysfs is valid. - - -CMOS/UCMS control ------------------ - -procfs: /proc/acpi/ibm/cmos -sysfs device attribute: cmos_command - -This feature is mostly used internally by the ACPI firmware to keep the legacy -CMOS NVRAM bits in sync with the current machine state, and to record this -state so that the ThinkPad will retain such settings across reboots. - -Some of these commands actually perform actions in some ThinkPad models, but -this is expected to disappear more and more in newer models. As an example, in -a T43 and in a X40, commands 12 and 13 still control the ThinkLight state for -real, but commands 0 to 2 don't control the mixer anymore (they have been -phased out) and just update the NVRAM. - -The range of valid cmos command numbers is 0 to 21, but not all have an -effect and the behavior varies from model to model. Here is the behavior -on the X40 (tpb is the ThinkPad Buttons utility): - - 0 - Related to "Volume down" key press - 1 - Related to "Volume up" key press - 2 - Related to "Mute on" key press - 3 - Related to "Access IBM" key press - 4 - Related to "LCD brightness up" key press - 5 - Related to "LCD brightness down" key press - 11 - Related to "toggle screen expansion" key press/function - 12 - Related to "ThinkLight on" - 13 - Related to "ThinkLight off" - 14 - Related to "ThinkLight" key press (toggle ThinkLight) - -The cmos command interface is prone to firmware split-brain problems, as -in newer ThinkPads it is just a compatibility layer. Do not use it, it is -exported just as a debug tool. - - -LED control ------------ - -procfs: /proc/acpi/ibm/led -sysfs attributes: as per LED class, see below for names - -Some of the LED indicators can be controlled through this feature. On -some older ThinkPad models, it is possible to query the status of the -LED indicators as well. Newer ThinkPads cannot query the real status -of the LED indicators. - -Because misuse of the LEDs could induce an unaware user to perform -dangerous actions (like undocking or ejecting a bay device while the -buses are still active), or mask an important alarm (such as a nearly -empty battery, or a broken battery), access to most LEDs is -restricted. - -Unrestricted access to all LEDs requires that thinkpad-acpi be -compiled with the CONFIG_THINKPAD_ACPI_UNSAFE_LEDS option enabled. -Distributions must never enable this option. Individual users that -are aware of the consequences are welcome to enabling it. - -Audio mute and microphone mute LEDs are supported, but currently not -visible to userspace. They are used by the snd-hda-intel audio driver. - -procfs notes: - -The available commands are: - - echo '<LED number> on' >/proc/acpi/ibm/led - echo '<LED number> off' >/proc/acpi/ibm/led - echo '<LED number> blink' >/proc/acpi/ibm/led - -The <LED number> range is 0 to 15. The set of LEDs that can be -controlled varies from model to model. Here is the common ThinkPad -mapping: - - 0 - power - 1 - battery (orange) - 2 - battery (green) - 3 - UltraBase/dock - 4 - UltraBay - 5 - UltraBase battery slot - 6 - (unknown) - 7 - standby - 8 - dock status 1 - 9 - dock status 2 - 10, 11 - (unknown) - 12 - thinkvantage - 13, 14, 15 - (unknown) - -All of the above can be turned on and off and can be made to blink. - -sysfs notes: - -The ThinkPad LED sysfs interface is described in detail by the LED class -documentation, in Documentation/leds/leds-class.txt. - -The LEDs are named (in LED ID order, from 0 to 12): -"tpacpi::power", "tpacpi:orange:batt", "tpacpi:green:batt", -"tpacpi::dock_active", "tpacpi::bay_active", "tpacpi::dock_batt", -"tpacpi::unknown_led", "tpacpi::standby", "tpacpi::dock_status1", -"tpacpi::dock_status2", "tpacpi::unknown_led2", "tpacpi::unknown_led3", -"tpacpi::thinkvantage". - -Due to limitations in the sysfs LED class, if the status of the LED -indicators cannot be read due to an error, thinkpad-acpi will report it as -a brightness of zero (same as LED off). - -If the thinkpad firmware doesn't support reading the current status, -trying to read the current LED brightness will just return whatever -brightness was last written to that attribute. - -These LEDs can blink using hardware acceleration. To request that a -ThinkPad indicator LED should blink in hardware accelerated mode, use the -"timer" trigger, and leave the delay_on and delay_off parameters set to -zero (to request hardware acceleration autodetection). - -LEDs that are known not to exist in a given ThinkPad model are not -made available through the sysfs interface. If you have a dock and you -notice there are LEDs listed for your ThinkPad that do not exist (and -are not in the dock), or if you notice that there are missing LEDs, -a report to ibm-acpi-devel@lists.sourceforge.net is appreciated. - - -ACPI sounds -- /proc/acpi/ibm/beep ----------------------------------- - -The BEEP method is used internally by the ACPI firmware to provide -audible alerts in various situations. This feature allows the same -sounds to be triggered manually. - -The commands are non-negative integer numbers: - - echo <number> >/proc/acpi/ibm/beep - -The valid <number> range is 0 to 17. Not all numbers trigger sounds -and the sounds vary from model to model. Here is the behavior on the -X40: - - 0 - stop a sound in progress (but use 17 to stop 16) - 2 - two beeps, pause, third beep ("low battery") - 3 - single beep - 4 - high, followed by low-pitched beep ("unable") - 5 - single beep - 6 - very high, followed by high-pitched beep ("AC/DC") - 7 - high-pitched beep - 9 - three short beeps - 10 - very long beep - 12 - low-pitched beep - 15 - three high-pitched beeps repeating constantly, stop with 0 - 16 - one medium-pitched beep repeating constantly, stop with 17 - 17 - stop 16 - - -Temperature sensors -------------------- - -procfs: /proc/acpi/ibm/thermal -sysfs device attributes: (hwmon "thinkpad") temp*_input - -Most ThinkPads include six or more separate temperature sensors but only -expose the CPU temperature through the standard ACPI methods. This -feature shows readings from up to eight different sensors on older -ThinkPads, and up to sixteen different sensors on newer ThinkPads. - -For example, on the X40, a typical output may be: -temperatures: 42 42 45 41 36 -128 33 -128 - -On the T43/p, a typical output may be: -temperatures: 48 48 36 52 38 -128 31 -128 48 52 48 -128 -128 -128 -128 -128 - -The mapping of thermal sensors to physical locations varies depending on -system-board model (and thus, on ThinkPad model). - -http://thinkwiki.org/wiki/Thermal_Sensors is a public wiki page that -tries to track down these locations for various models. - -Most (newer?) models seem to follow this pattern: - -1: CPU -2: (depends on model) -3: (depends on model) -4: GPU -5: Main battery: main sensor -6: Bay battery: main sensor -7: Main battery: secondary sensor -8: Bay battery: secondary sensor -9-15: (depends on model) - -For the R51 (source: Thomas Gruber): -2: Mini-PCI -3: Internal HDD - -For the T43, T43/p (source: Shmidoax/Thinkwiki.org) -http://thinkwiki.org/wiki/Thermal_Sensors#ThinkPad_T43.2C_T43p -2: System board, left side (near PCMCIA slot), reported as HDAPS temp -3: PCMCIA slot -9: MCH (northbridge) to DRAM Bus -10: Clock-generator, mini-pci card and ICH (southbridge), under Mini-PCI - card, under touchpad -11: Power regulator, underside of system board, below F2 key - -The A31 has a very atypical layout for the thermal sensors -(source: Milos Popovic, http://thinkwiki.org/wiki/Thermal_Sensors#ThinkPad_A31) -1: CPU -2: Main Battery: main sensor -3: Power Converter -4: Bay Battery: main sensor -5: MCH (northbridge) -6: PCMCIA/ambient -7: Main Battery: secondary sensor -8: Bay Battery: secondary sensor - - -Procfs notes: - Readings from sensors that are not available return -128. - No commands can be written to this file. - -Sysfs notes: - Sensors that are not available return the ENXIO error. This - status may change at runtime, as there are hotplug thermal - sensors, like those inside the batteries and docks. - - thinkpad-acpi thermal sensors are reported through the hwmon - subsystem, and follow all of the hwmon guidelines at - Documentation/hwmon. - -EXPERIMENTAL: Embedded controller register dump ------------------------------------------------ - -This feature is not included in the thinkpad driver anymore. -Instead the EC can be accessed through /sys/kernel/debug/ec with -a userspace tool which can be found here: -ftp://ftp.suse.com/pub/people/trenn/sources/ec - -Use it to determine the register holding the fan -speed on some models. To do that, do the following: - - make sure the battery is fully charged - - make sure the fan is running - - use above mentioned tool to read out the EC - -Often fan and temperature values vary between -readings. Since temperatures don't change vary fast, you can take -several quick dumps to eliminate them. - -You can use a similar method to figure out the meaning of other -embedded controller registers - e.g. make sure nothing else changes -except the charging or discharging battery to determine which -registers contain the current battery capacity, etc. If you experiment -with this, do send me your results (including some complete dumps with -a description of the conditions when they were taken.) - - -LCD brightness control ----------------------- - -procfs: /proc/acpi/ibm/brightness -sysfs backlight device "thinkpad_screen" - -This feature allows software control of the LCD brightness on ThinkPad -models which don't have a hardware brightness slider. - -It has some limitations: the LCD backlight cannot be actually turned -on or off by this interface, it just controls the backlight brightness -level. - -On IBM (and some of the earlier Lenovo) ThinkPads, the backlight control -has eight brightness levels, ranging from 0 to 7. Some of the levels -may not be distinct. Later Lenovo models that implement the ACPI -display backlight brightness control methods have 16 levels, ranging -from 0 to 15. - -For IBM ThinkPads, there are two interfaces to the firmware for direct -brightness control, EC and UCMS (or CMOS). To select which one should be -used, use the brightness_mode module parameter: brightness_mode=1 selects -EC mode, brightness_mode=2 selects UCMS mode, brightness_mode=3 selects EC -mode with NVRAM backing (so that brightness changes are remembered across -shutdown/reboot). - -The driver tries to select which interface to use from a table of -defaults for each ThinkPad model. If it makes a wrong choice, please -report this as a bug, so that we can fix it. - -Lenovo ThinkPads only support brightness_mode=2 (UCMS). - -When display backlight brightness controls are available through the -standard ACPI interface, it is best to use it instead of this direct -ThinkPad-specific interface. The driver will disable its native -backlight brightness control interface if it detects that the standard -ACPI interface is available in the ThinkPad. - -If you want to use the thinkpad-acpi backlight brightness control -instead of the generic ACPI video backlight brightness control for some -reason, you should use the acpi_backlight=vendor kernel parameter. - -The brightness_enable module parameter can be used to control whether -the LCD brightness control feature will be enabled when available. -brightness_enable=0 forces it to be disabled. brightness_enable=1 -forces it to be enabled when available, even if the standard ACPI -interface is also available. - -Procfs notes: - - The available commands are: - - echo up >/proc/acpi/ibm/brightness - echo down >/proc/acpi/ibm/brightness - echo 'level <level>' >/proc/acpi/ibm/brightness - -Sysfs notes: - -The interface is implemented through the backlight sysfs class, which is -poorly documented at this time. - -Locate the thinkpad_screen device under /sys/class/backlight, and inside -it there will be the following attributes: - - max_brightness: - Reads the maximum brightness the hardware can be set to. - The minimum is always zero. - - actual_brightness: - Reads what brightness the screen is set to at this instant. - - brightness: - Writes request the driver to change brightness to the - given value. Reads will tell you what brightness the - driver is trying to set the display to when "power" is set - to zero and the display has not been dimmed by a kernel - power management event. - - power: - power management mode, where 0 is "display on", and 1 to 3 - will dim the display backlight to brightness level 0 - because thinkpad-acpi cannot really turn the backlight - off. Kernel power management events can temporarily - increase the current power management level, i.e. they can - dim the display. - - -WARNING: - - Whatever you do, do NOT ever call thinkpad-acpi backlight-level change - interface and the ACPI-based backlight level change interface - (available on newer BIOSes, and driven by the Linux ACPI video driver) - at the same time. The two will interact in bad ways, do funny things, - and maybe reduce the life of the backlight lamps by needlessly kicking - its level up and down at every change. - - -Volume control (Console Audio control) --------------------------------------- - -procfs: /proc/acpi/ibm/volume -ALSA: "ThinkPad Console Audio Control", default ID: "ThinkPadEC" - -NOTE: by default, the volume control interface operates in read-only -mode, as it is supposed to be used for on-screen-display purposes. -The read/write mode can be enabled through the use of the -"volume_control=1" module parameter. - -NOTE: distros are urged to not enable volume_control by default, this -should be done by the local admin only. The ThinkPad UI is for the -console audio control to be done through the volume keys only, and for -the desktop environment to just provide on-screen-display feedback. -Software volume control should be done only in the main AC97/HDA -mixer. - - -About the ThinkPad Console Audio control: - -ThinkPads have a built-in amplifier and muting circuit that drives the -console headphone and speakers. This circuit is after the main AC97 -or HDA mixer in the audio path, and under exclusive control of the -firmware. - -ThinkPads have three special hotkeys to interact with the console -audio control: volume up, volume down and mute. - -It is worth noting that the normal way the mute function works (on -ThinkPads that do not have a "mute LED") is: - -1. Press mute to mute. It will *always* mute, you can press it as - many times as you want, and the sound will remain mute. - -2. Press either volume key to unmute the ThinkPad (it will _not_ - change the volume, it will just unmute). - -This is a very superior design when compared to the cheap software-only -mute-toggle solution found on normal consumer laptops: you can be -absolutely sure the ThinkPad will not make noise if you press the mute -button, no matter the previous state. - -The IBM ThinkPads, and the earlier Lenovo ThinkPads have variable-gain -amplifiers driving the speakers and headphone output, and the firmware -also handles volume control for the headphone and speakers on these -ThinkPads without any help from the operating system (this volume -control stage exists after the main AC97 or HDA mixer in the audio -path). - -The newer Lenovo models only have firmware mute control, and depend on -the main HDA mixer to do volume control (which is done by the operating -system). In this case, the volume keys are filtered out for unmute -key press (there are some firmware bugs in this area) and delivered as -normal key presses to the operating system (thinkpad-acpi is not -involved). - - -The ThinkPad-ACPI volume control: - -The preferred way to interact with the Console Audio control is the -ALSA interface. - -The legacy procfs interface allows one to read the current state, -and if volume control is enabled, accepts the following commands: - - echo up >/proc/acpi/ibm/volume - echo down >/proc/acpi/ibm/volume - echo mute >/proc/acpi/ibm/volume - echo unmute >/proc/acpi/ibm/volume - echo 'level <level>' >/proc/acpi/ibm/volume - -The <level> number range is 0 to 14 although not all of them may be -distinct. To unmute the volume after the mute command, use either the -up or down command (the level command will not unmute the volume), or -the unmute command. - -You can use the volume_capabilities parameter to tell the driver -whether your thinkpad has volume control or mute-only control: -volume_capabilities=1 for mixers with mute and volume control, -volume_capabilities=2 for mixers with only mute control. - -If the driver misdetects the capabilities for your ThinkPad model, -please report this to ibm-acpi-devel@lists.sourceforge.net, so that we -can update the driver. - -There are two strategies for volume control. To select which one -should be used, use the volume_mode module parameter: volume_mode=1 -selects EC mode, and volume_mode=3 selects EC mode with NVRAM backing -(so that volume/mute changes are remembered across shutdown/reboot). - -The driver will operate in volume_mode=3 by default. If that does not -work well on your ThinkPad model, please report this to -ibm-acpi-devel@lists.sourceforge.net. - -The driver supports the standard ALSA module parameters. If the ALSA -mixer is disabled, the driver will disable all volume functionality. - - -Fan control and monitoring: fan speed, fan enable/disable ---------------------------------------------------------- - -procfs: /proc/acpi/ibm/fan -sysfs device attributes: (hwmon "thinkpad") fan1_input, pwm1, - pwm1_enable, fan2_input -sysfs hwmon driver attributes: fan_watchdog - -NOTE NOTE NOTE: fan control operations are disabled by default for -safety reasons. To enable them, the module parameter "fan_control=1" -must be given to thinkpad-acpi. - -This feature attempts to show the current fan speed, control mode and -other fan data that might be available. The speed is read directly -from the hardware registers of the embedded controller. This is known -to work on later R, T, X and Z series ThinkPads but may show a bogus -value on other models. - -Some Lenovo ThinkPads support a secondary fan. This fan cannot be -controlled separately, it shares the main fan control. - -Fan levels: - -Most ThinkPad fans work in "levels" at the firmware interface. Level 0 -stops the fan. The higher the level, the higher the fan speed, although -adjacent levels often map to the same fan speed. 7 is the highest -level, where the fan reaches the maximum recommended speed. - -Level "auto" means the EC changes the fan level according to some -internal algorithm, usually based on readings from the thermal sensors. - -There is also a "full-speed" level, also known as "disengaged" level. -In this level, the EC disables the speed-locked closed-loop fan control, -and drives the fan as fast as it can go, which might exceed hardware -limits, so use this level with caution. - -The fan usually ramps up or down slowly from one speed to another, and -it is normal for the EC to take several seconds to react to fan -commands. The full-speed level may take up to two minutes to ramp up to -maximum speed, and in some ThinkPads, the tachometer readings go stale -while the EC is transitioning to the full-speed level. - -WARNING WARNING WARNING: do not leave the fan disabled unless you are -monitoring all of the temperature sensor readings and you are ready to -enable it if necessary to avoid overheating. - -An enabled fan in level "auto" may stop spinning if the EC decides the -ThinkPad is cool enough and doesn't need the extra airflow. This is -normal, and the EC will spin the fan up if the various thermal readings -rise too much. - -On the X40, this seems to depend on the CPU and HDD temperatures. -Specifically, the fan is turned on when either the CPU temperature -climbs to 56 degrees or the HDD temperature climbs to 46 degrees. The -fan is turned off when the CPU temperature drops to 49 degrees and the -HDD temperature drops to 41 degrees. These thresholds cannot -currently be controlled. - -The ThinkPad's ACPI DSDT code will reprogram the fan on its own when -certain conditions are met. It will override any fan programming done -through thinkpad-acpi. - -The thinkpad-acpi kernel driver can be programmed to revert the fan -level to a safe setting if userspace does not issue one of the procfs -fan commands: "enable", "disable", "level" or "watchdog", or if there -are no writes to pwm1_enable (or to pwm1 *if and only if* pwm1_enable is -set to 1, manual mode) within a configurable amount of time of up to -120 seconds. This functionality is called fan safety watchdog. - -Note that the watchdog timer stops after it enables the fan. It will be -rearmed again automatically (using the same interval) when one of the -above mentioned fan commands is received. The fan watchdog is, -therefore, not suitable to protect against fan mode changes made through -means other than the "enable", "disable", and "level" procfs fan -commands, or the hwmon fan control sysfs interface. - -Procfs notes: - -The fan may be enabled or disabled with the following commands: - - echo enable >/proc/acpi/ibm/fan - echo disable >/proc/acpi/ibm/fan - -Placing a fan on level 0 is the same as disabling it. Enabling a fan -will try to place it in a safe level if it is too slow or disabled. - -The fan level can be controlled with the command: - - echo 'level <level>' > /proc/acpi/ibm/fan - -Where <level> is an integer from 0 to 7, or one of the words "auto" or -"full-speed" (without the quotes). Not all ThinkPads support the "auto" -and "full-speed" levels. The driver accepts "disengaged" as an alias for -"full-speed", and reports it as "disengaged" for backwards -compatibility. - -On the X31 and X40 (and ONLY on those models), the fan speed can be -controlled to a certain degree. Once the fan is running, it can be -forced to run faster or slower with the following command: - - echo 'speed <speed>' > /proc/acpi/ibm/fan - -The sustainable range of fan speeds on the X40 appears to be from about -3700 to about 7350. Values outside this range either do not have any -effect or the fan speed eventually settles somewhere in that range. The -fan cannot be stopped or started with this command. This functionality -is incomplete, and not available through the sysfs interface. - -To program the safety watchdog, use the "watchdog" command. - - echo 'watchdog <interval in seconds>' > /proc/acpi/ibm/fan - -If you want to disable the watchdog, use 0 as the interval. - -Sysfs notes: - -The sysfs interface follows the hwmon subsystem guidelines for the most -part, and the exception is the fan safety watchdog. - -Writes to any of the sysfs attributes may return the EINVAL error if -that operation is not supported in a given ThinkPad or if the parameter -is out-of-bounds, and EPERM if it is forbidden. They may also return -EINTR (interrupted system call), and EIO (I/O error while trying to talk -to the firmware). - -Features not yet implemented by the driver return ENOSYS. - -hwmon device attribute pwm1_enable: - 0: PWM offline (fan is set to full-speed mode) - 1: Manual PWM control (use pwm1 to set fan level) - 2: Hardware PWM control (EC "auto" mode) - 3: reserved (Software PWM control, not implemented yet) - - Modes 0 and 2 are not supported by all ThinkPads, and the - driver is not always able to detect this. If it does know a - mode is unsupported, it will return -EINVAL. - -hwmon device attribute pwm1: - Fan level, scaled from the firmware values of 0-7 to the hwmon - scale of 0-255. 0 means fan stopped, 255 means highest normal - speed (level 7). - - This attribute only commands the fan if pmw1_enable is set to 1 - (manual PWM control). - -hwmon device attribute fan1_input: - Fan tachometer reading, in RPM. May go stale on certain - ThinkPads while the EC transitions the PWM to offline mode, - which can take up to two minutes. May return rubbish on older - ThinkPads. - -hwmon device attribute fan2_input: - Fan tachometer reading, in RPM, for the secondary fan. - Available only on some ThinkPads. If the secondary fan is - not installed, will always read 0. - -hwmon driver attribute fan_watchdog: - Fan safety watchdog timer interval, in seconds. Minimum is - 1 second, maximum is 120 seconds. 0 disables the watchdog. - -To stop the fan: set pwm1 to zero, and pwm1_enable to 1. - -To start the fan in a safe mode: set pwm1_enable to 2. If that fails -with EINVAL, try to set pwm1_enable to 1 and pwm1 to at least 128 (255 -would be the safest choice, though). - - -WAN ---- - -procfs: /proc/acpi/ibm/wan -sysfs device attribute: wwan_enable (deprecated) -sysfs rfkill class: switch "tpacpi_wwan_sw" - -This feature shows the presence and current state of the built-in -Wireless WAN device. - -If the ThinkPad supports it, the WWAN state is stored in NVRAM, -so it is kept across reboots and power-off. - -It was tested on a Lenovo ThinkPad X60. It should probably work on other -ThinkPad models which come with this module installed. - -Procfs notes: - -If the W-WAN card is installed, the following commands can be used: - - echo enable > /proc/acpi/ibm/wan - echo disable > /proc/acpi/ibm/wan - -Sysfs notes: - - If the W-WAN card is installed, it can be enabled / - disabled through the "wwan_enable" thinkpad-acpi device - attribute, and its current status can also be queried. - - enable: - 0: disables WWAN card / WWAN card is disabled - 1: enables WWAN card / WWAN card is enabled. - - Note: this interface has been superseded by the generic rfkill - class. It has been deprecated, and it will be removed in year - 2010. - - rfkill controller switch "tpacpi_wwan_sw": refer to - Documentation/rfkill.txt for details. - - -EXPERIMENTAL: UWB ------------------ - -This feature is considered EXPERIMENTAL because it has not been extensively -tested and validated in various ThinkPad models yet. The feature may not -work as expected. USE WITH CAUTION! To use this feature, you need to supply -the experimental=1 parameter when loading the module. - -sysfs rfkill class: switch "tpacpi_uwb_sw" - -This feature exports an rfkill controller for the UWB device, if one is -present and enabled in the BIOS. - -Sysfs notes: - - rfkill controller switch "tpacpi_uwb_sw": refer to - Documentation/rfkill.txt for details. - -Adaptive keyboard ------------------ - -sysfs device attribute: adaptive_kbd_mode - -This sysfs attribute controls the keyboard "face" that will be shown on the -Lenovo X1 Carbon 2nd gen (2014)'s adaptive keyboard. The value can be read -and set. - -1 = Home mode -2 = Web-browser mode -3 = Web-conference mode -4 = Function mode -5 = Layflat mode - -For more details about which buttons will appear depending on the mode, please -review the laptop's user guide: -http://www.lenovo.com/shop/americas/content/user_guides/x1carbon_2_ug_en.pdf - -Multiple Commands, Module Parameters ------------------------------------- - -Multiple commands can be written to the proc files in one shot by -separating them with commas, for example: - - echo enable,0xffff > /proc/acpi/ibm/hotkey - echo lcd_disable,crt_enable > /proc/acpi/ibm/video - -Commands can also be specified when loading the thinkpad-acpi module, -for example: - - modprobe thinkpad_acpi hotkey=enable,0xffff video=auto_disable - - -Enabling debugging output -------------------------- - -The module takes a debug parameter which can be used to selectively -enable various classes of debugging output, for example: - - modprobe thinkpad_acpi debug=0xffff - -will enable all debugging output classes. It takes a bitmask, so -to enable more than one output class, just add their values. - - Debug bitmask Description - 0x8000 Disclose PID of userspace programs - accessing some functions of the driver - 0x0001 Initialization and probing - 0x0002 Removal - 0x0004 RF Transmitter control (RFKILL) - (bluetooth, WWAN, UWB...) - 0x0008 HKEY event interface, hotkeys - 0x0010 Fan control - 0x0020 Backlight brightness - 0x0040 Audio mixer/volume control - -There is also a kernel build option to enable more debugging -information, which may be necessary to debug driver problems. - -The level of debugging information output by the driver can be changed -at runtime through sysfs, using the driver attribute debug_level. The -attribute takes the same bitmask as the debug module parameter above. - - -Force loading of module ------------------------ - -If thinkpad-acpi refuses to detect your ThinkPad, you can try to specify -the module parameter force_load=1. Regardless of whether this works or -not, please contact ibm-acpi-devel@lists.sourceforge.net with a report. - - -Sysfs interface changelog: - -0x000100: Initial sysfs support, as a single platform driver and - device. -0x000200: Hot key support for 32 hot keys, and radio slider switch - support. -0x010000: Hot keys are now handled by default over the input - layer, the radio switch generates input event EV_RADIO, - and the driver enables hot key handling by default in - the firmware. - -0x020000: ABI fix: added a separate hwmon platform device and - driver, which must be located by name (thinkpad) - and the hwmon class for libsensors4 (lm-sensors 3) - compatibility. Moved all hwmon attributes to this - new platform device. - -0x020100: Marker for thinkpad-acpi with hot key NVRAM polling - support. If you must, use it to know you should not - start a userspace NVRAM poller (allows to detect when - NVRAM is compiled out by the user because it is - unneeded/undesired in the first place). -0x020101: Marker for thinkpad-acpi with hot key NVRAM polling - and proper hotkey_mask semantics (version 8 of the - NVRAM polling patch). Some development snapshots of - 0.18 had an earlier version that did strange things - to hotkey_mask. - -0x020200: Add poll()/select() support to the following attributes: - hotkey_radio_sw, wakeup_hotunplug_complete, wakeup_reason - -0x020300: hotkey enable/disable support removed, attributes - hotkey_bios_enabled and hotkey_enable deprecated and - marked for removal. - -0x020400: Marker for 16 LEDs support. Also, LEDs that are known - to not exist in a given model are not registered with - the LED sysfs class anymore. - -0x020500: Updated hotkey driver, hotkey_mask is always available - and it is always able to disable hot keys. Very old - thinkpads are properly supported. hotkey_bios_mask - is deprecated and marked for removal. - -0x020600: Marker for backlight change event support. - -0x020700: Support for mute-only mixers. - Volume control in read-only mode by default. - Marker for ALSA mixer support. - -0x030000: Thermal and fan sysfs attributes were moved to the hwmon - device instead of being attached to the backing platform - device. |