path: root/Documentation/power/video.txt
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authorMauro Carvalho Chehab <mchehab+samsung@kernel.org>2019-06-13 07:10:36 -0300
committerBjorn Helgaas <bhelgaas@google.com>2019-06-14 16:08:36 -0500
commit151f4e2bdc7a04020ae5c533896fb91a16e1f501 (patch)
tree20c8504f4fea46bf421107074f511fd51acf44fc /Documentation/power/video.txt
parentDocumentation: PCI: convert endpoint/pci-test-howto.txt to reST (diff)
docs: power: convert docs to ReST and rename to *.rst
Convert the PM documents to ReST, in order to allow them to build with Sphinx. The conversion is actually: - add blank lines and indentation in order to identify paragraphs; - fix tables markups; - add some lists markups; - mark literal blocks; - adjust title markups. At its new index.rst, let's add a :orphan: while this is not linked to the main index.rst file, in order to avoid build warnings. Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Acked-by: Mark Brown <broonie@kernel.org> Acked-by: Srivatsa S. Bhat (VMware) <srivatsa@csail.mit.edu>
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- Video issues with S3 resume
- ~~~~~~~~~~~~~~~~~~~~~~~~~~~
- 2003-2006, Pavel Machek
-During S3 resume, hardware needs to be reinitialized. For most
-devices, this is easy, and kernel driver knows how to do
-it. Unfortunately there's one exception: video card. Those are usually
-initialized by BIOS, and kernel does not have enough information to
-boot video card. (Kernel usually does not even contain video card
-driver -- vesafb and vgacon are widely used).
-This is not problem for swsusp, because during swsusp resume, BIOS is
-run normally so video card is normally initialized. It should not be
-problem for S1 standby, because hardware should retain its state over
-We either have to run video BIOS during early resume, or interpret it
-using vbetool later, or maybe nothing is necessary on particular
-system because video state is preserved. Unfortunately different
-methods work on different systems, and no known method suits all of
-Userland application called s2ram has been developed; it contains long
-whitelist of systems, and automatically selects working method for a
-given system. It can be downloaded from CVS at
-www.sf.net/projects/suspend . If you get a system that is not in the
-whitelist, please try to find a working solution, and submit whitelist
-entry so that work does not need to be repeated.
-Currently, VBE_SAVE method (6 below) works on most
-systems. Unfortunately, vbetool only runs after userland is resumed,
-so it makes debugging of early resume problems
-hard/impossible. Methods that do not rely on userland are preferable.
-There are a few types of systems where video works after S3 resume:
-(1) systems where video state is preserved over S3.
-(2) systems where it is possible to call the video BIOS during S3
- resume. Unfortunately, it is not correct to call the video BIOS at
- that point, but it happens to work on some machines. Use
- acpi_sleep=s3_bios.
-(3) systems that initialize video card into vga text mode and where
- the BIOS works well enough to be able to set video mode. Use
- acpi_sleep=s3_mode on these.
-(4) on some systems s3_bios kicks video into text mode, and
- acpi_sleep=s3_bios,s3_mode is needed.
-(5) radeon systems, where X can soft-boot your video card. You'll need
- a new enough X, and a plain text console (no vesafb or radeonfb). See
- http://www.doesi.gmxhome.de/linux/tm800s3/s3.html for more information.
- Alternatively, you should use vbetool (6) instead.
-(6) other radeon systems, where vbetool is enough to bring system back
- to life. It needs text console to be working. Do vbetool vbestate
- save > /tmp/delme; echo 3 > /proc/acpi/sleep; vbetool post; vbetool
- vbestate restore < /tmp/delme; setfont <whatever>, and your video
- should work.
-(7) on some systems, it is possible to boot most of kernel, and then
- POSTing bios works. Ole Rohne has patch to do just that at
- http://dev.gentoo.org/~marineam/patch-radeonfb-2.6.11-rc2-mm2.
-(8) on some systems, you can use the video_post utility and or
- do echo 3 > /sys/power/state && /usr/sbin/video_post - which will
- initialize the display in console mode. If you are in X, you can switch
- to a virtual terminal and back to X using CTRL+ALT+F1 - CTRL+ALT+F7 to get
- the display working in graphical mode again.
-Now, if you pass acpi_sleep=something, and it does not work with your
-bios, you'll get a hard crash during resume. Be careful. Also it is
-safest to do your experiments with plain old VGA console. The vesafb
-and radeonfb (etc) drivers have a tendency to crash the machine during
-You may have a system where none of above works. At that point you
-either invent another ugly hack that works, or write proper driver for
-your video card (good luck getting docs :-(). Maybe suspending from X
-(proper X, knowing your hardware, not XF68_FBcon) might have better
-chance of working.
-Table of known working notebooks:
-Model hack (or "how to do it")
-Acer Aspire 1406LC ole's late BIOS init (7), turn off DRI
-Acer TM 230 s3_bios (2)
-Acer TM 242FX vbetool (6)
-Acer TM C110 video_post (8)
-Acer TM C300 vga=normal (only suspend on console, not in X), vbetool (6) or video_post (8)
-Acer TM 4052LCi s3_bios (2)
-Acer TM 636Lci s3_bios,s3_mode (4)
-Acer TM 650 (Radeon M7) vga=normal plus boot-radeon (5) gets text console back
-Acer TM 660 ??? (*)
-Acer TM 800 vga=normal, X patches, see webpage (5) or vbetool (6)
-Acer TM 803 vga=normal, X patches, see webpage (5) or vbetool (6)
-Acer TM 803LCi vga=normal, vbetool (6)
-Arima W730a vbetool needed (6)
-Asus L2400D s3_mode (3)(***) (S1 also works OK)
-Asus L3350M (SiS 740) (6)
-Asus L3800C (Radeon M7) s3_bios (2) (S1 also works OK)
-Asus M6887Ne vga=normal, s3_bios (2), use radeon driver instead of fglrx in x.org
-Athlon64 desktop prototype s3_bios (2)
-Compal CL-50 ??? (*)
-Compaq Armada E500 - P3-700 none (1) (S1 also works OK)
-Compaq Evo N620c vga=normal, s3_bios (2)
-Dell 600m, ATI R250 Lf none (1), but needs xorg-x11-
-Dell D600, ATI RV250 vga=normal and X, or try vbestate (6)
-Dell D610 vga=normal and X (possibly vbestate (6) too, but not tested)
-Dell Inspiron 4000 ??? (*)
-Dell Inspiron 500m ??? (*)
-Dell Inspiron 510m ???
-Dell Inspiron 5150 vbetool needed (6)
-Dell Inspiron 600m ??? (*)
-Dell Inspiron 8200 ??? (*)
-Dell Inspiron 8500 ??? (*)
-Dell Inspiron 8600 ??? (*)
-eMachines athlon64 machines vbetool needed (6) (someone please get me model #s)
-HP NC6000 s3_bios, may not use radeonfb (2); or vbetool (6)
-HP NX7000 ??? (*)
-HP Pavilion ZD7000 vbetool post needed, need open-source nv driver for X
-HP Omnibook XE3 athlon version none (1)
-HP Omnibook XE3GC none (1), video is S3 Savage/IX-MV
-HP Omnibook XE3L-GF vbetool (6)
-HP Omnibook 5150 none (1), (S1 also works OK)
-IBM TP T20, model 2647-44G none (1), video is S3 Inc. 86C270-294 Savage/IX-MV, vesafb gets "interesting" but X work.
-IBM TP A31 / Type 2652-M5G s3_mode (3) [works ok with BIOS 1.04 2002-08-23, but not at all with BIOS 1.11 2004-11-05 :-(]
-IBM TP R32 / Type 2658-MMG none (1)
-IBM TP R40 2722B3G ??? (*)
-IBM TP R50p / Type 1832-22U s3_bios (2)
-IBM TP R51 none (1)
-IBM TP T30 236681A ??? (*)
-IBM TP T40 / Type 2373-MU4 none (1)
-IBM TP T40p none (1)
-IBM TP R40p s3_bios (2)
-IBM TP T41p s3_bios (2), switch to X after resume
-IBM TP T42 s3_bios (2)
-IBM ThinkPad T42p (2373-GTG) s3_bios (2)
-IBM TP X20 ??? (*)
-IBM TP X30 s3_bios, s3_mode (4)
-IBM TP X31 / Type 2672-XXH none (1), use radeontool (http://fdd.com/software/radeon/) to turn off backlight.
-IBM TP X32 none (1), but backlight is on and video is trashed after long suspend. s3_bios,s3_mode (4) works too. Perhaps that gets better results?
-IBM Thinkpad X40 Type 2371-7JG s3_bios,s3_mode (4)
-IBM TP 600e none(1), but a switch to console and back to X is needed
-Medion MD4220 ??? (*)
-Samsung P35 vbetool needed (6)
-Sharp PC-AR10 (ATI rage) none (1), backlight does not switch off
-Sony Vaio PCG-C1VRX/K s3_bios (2)
-Sony Vaio PCG-F403 ??? (*)
-Sony Vaio PCG-GRT995MP none (1), works with 'nv' X driver
-Sony Vaio PCG-GR7/K none (1), but needs radeonfb, use radeontool (http://fdd.com/software/radeon/) to turn off backlight.
-Sony Vaio PCG-N505SN ??? (*)
-Sony Vaio vgn-s260 X or boot-radeon can init it (5)
-Sony Vaio vgn-S580BH vga=normal, but suspend from X. Console will be blank unless you return to X.
-Sony Vaio vgn-FS115B s3_bios (2),s3_mode (4)
-Toshiba Libretto L5 none (1)
-Toshiba Libretto 100CT/110CT vbetool (6)
-Toshiba Portege 3020CT s3_mode (3)
-Toshiba Satellite 4030CDT s3_mode (3) (S1 also works OK)
-Toshiba Satellite 4080XCDT s3_mode (3) (S1 also works OK)
-Toshiba Satellite 4090XCDT ??? (*)
-Toshiba Satellite P10-554 s3_bios,s3_mode (4)(****)
-Toshiba M30 (2) xor X with nvidia driver using internal AGP
-Uniwill 244IIO ??? (*)
-Known working desktop systems
-Mainboard Graphics card hack (or "how to do it")
-Asus A7V8X nVidia RIVA TNT2 model 64 s3_bios,s3_mode (4)
-(*) from https://wiki.ubuntu.com/HoaryPMResults, not sure
- which options to use. If you know, please tell me.
-(***) To be tested with a newer kernel.
-(****) Not with SMP kernel, UP only.