diff options
| author |   Aaron Lu <aaron.lu@intel.com> | 2013-06-21 00:15:59 +0200 |
|---|---|---|
| committer |   Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2013-06-21 00:15:59 +0200 |
| commit | 70e66e4df19167653aba95b4dacbcfd3254a4019 (patch) | |
| tree | 23b49c176becf710e458aadd91f6cde6a9cc2f68 /Documentation/acpi | |
| parent | ACPI / video: add description for brightness_switch_enabled (diff) | |
| download | wireguard-linux-70e66e4df19167653aba95b4dacbcfd3254a4019.tar.xz wireguard-linux-70e66e4df19167653aba95b4dacbcfd3254a4019.zip | |
ACPI / video: move video_extension.txt to Documentation/acpi
ACPI video driver is written according to ACPI spec, appendix B: Video
Extensions. So it better be put under the acpi directory instead of the
power directory. This patch moves the file there without any other
change.
Signed-off-by: Aaron Lu <aaron.lu@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'Documentation/acpi')
| -rw-r--r-- | Documentation/acpi/video_extension.txt | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/Documentation/acpi/video_extension.txt b/Documentation/acpi/video_extension.txt new file mode 100644 index 000000000000..b2f9b1598ac2 --- /dev/null +++ b/Documentation/acpi/video_extension.txt @@ -0,0 +1,37 @@ +ACPI video extensions +~~~~~~~~~~~~~~~~~~~~~ + +This driver implement the ACPI Extensions For Display Adapters for +integrated graphics devices on motherboard, as specified in ACPI 2.0 +Specification, Appendix B, allowing to perform some basic control like +defining the video POST device, retrieving EDID information or to +setup a video output, etc. Note that this is an ref. implementation +only. It may or may not work for your integrated video device. + +Interfaces exposed to userland through /proc/acpi/video: + +VGA/info : display the supported video bus device capability like Video ROM, CRT/LCD/TV. +VGA/ROM : Used to get a copy of the display devices' ROM data (up to 4k). +VGA/POST_info : Used to determine what options are implemented. +VGA/POST : Used to get/set POST device. +VGA/DOS : Used to get/set ownership of output switching: + Please refer ACPI spec B.4.1 _DOS +VGA/CRT : CRT output +VGA/LCD : LCD output +VGA/TVO : TV output +VGA/*/brightness : Used to get/set brightness of output device + +Notify event through /proc/acpi/event: + +#define ACPI_VIDEO_NOTIFY_SWITCH 0x80 +#define ACPI_VIDEO_NOTIFY_PROBE 0x81 +#define ACPI_VIDEO_NOTIFY_CYCLE 0x82 +#define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT 0x83 +#define ACPI_VIDEO_NOTIFY_PREV_OUTPUT 0x84 + +#define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS 0x82 +#define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS 0x83 +#define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS 0x84 +#define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS 0x85 +#define ACPI_VIDEO_NOTIFY_DISPLAY_OFF 0x86 + |