linux/Documentation/power/video.txt
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   2                Video issues with S3 resume
   3                ~~~~~~~~~~~~~~~~~~~~~~~~~~~
   4                  2003-2006, Pavel Machek
   5
   6During S3 resume, hardware needs to be reinitialized. For most
   7devices, this is easy, and kernel driver knows how to do
   8it. Unfortunately there's one exception: video card. Those are usually
   9initialized by BIOS, and kernel does not have enough information to
  10boot video card. (Kernel usually does not even contain video card
  11driver -- vesafb and vgacon are widely used).
  12
  13This is not problem for swsusp, because during swsusp resume, BIOS is
  14run normally so video card is normally initialized. It should not be
  15problem for S1 standby, because hardware should retain its state over
  16that.
  17
  18We either have to run video BIOS during early resume, or interpret it
  19using vbetool later, or maybe nothing is necessary on particular
  20system because video state is preserved. Unfortunately different
  21methods work on different systems, and no known method suits all of
  22them.
  23
  24Userland application called s2ram has been developed; it contains long
  25whitelist of systems, and automatically selects working method for a
  26given system. It can be downloaded from CVS at
  27www.sf.net/projects/suspend . If you get a system that is not in the
  28whitelist, please try to find a working solution, and submit whitelist
  29entry so that work does not need to be repeated.
  30
  31Currently, VBE_SAVE method (6 below) works on most
  32systems. Unfortunately, vbetool only runs after userland is resumed,
  33so it makes debugging of early resume problems
  34hard/impossible. Methods that do not rely on userland are preferable.
  35
  36Details
  37~~~~~~~
  38
  39There are a few types of systems where video works after S3 resume:
  40
  41(1) systems where video state is preserved over S3.
  42
  43(2) systems where it is possible to call the video BIOS during S3
  44  resume. Unfortunately, it is not correct to call the video BIOS at
  45  that point, but it happens to work on some machines. Use
  46  acpi_sleep=s3_bios.
  47
  48(3) systems that initialize video card into vga text mode and where
  49  the BIOS works well enough to be able to set video mode. Use
  50  acpi_sleep=s3_mode on these.
  51
  52(4) on some systems s3_bios kicks video into text mode, and
  53  acpi_sleep=s3_bios,s3_mode is needed.
  54
  55(5) radeon systems, where X can soft-boot your video card. You'll need
  56  a new enough X, and a plain text console (no vesafb or radeonfb). See
  57  http://www.doesi.gmxhome.de/linux/tm800s3/s3.html for more information.
  58  Alternatively, you should use vbetool (6) instead.
  59
  60(6) other radeon systems, where vbetool is enough to bring system back
  61  to life. It needs text console to be working. Do vbetool vbestate
  62  save > /tmp/delme; echo 3 > /proc/acpi/sleep; vbetool post; vbetool
  63  vbestate restore < /tmp/delme; setfont <whatever>, and your video
  64  should work.
  65
  66(7) on some systems, it is possible to boot most of kernel, and then
  67  POSTing bios works. Ole Rohne has patch to do just that at
  68  http://dev.gentoo.org/~marineam/patch-radeonfb-2.6.11-rc2-mm2.
  69
  70(8) on some systems, you can use the video_post utility and or 
  71  do echo 3 > /sys/power/state  && /usr/sbin/video_post - which will 
  72  initialize the display in console mode. If you are in X, you can switch
  73  to a virtual terminal and back to X using  CTRL+ALT+F1 - CTRL+ALT+F7 to get
  74  the display working in graphical mode again.
  75
  76Now, if you pass acpi_sleep=something, and it does not work with your
  77bios, you'll get a hard crash during resume. Be careful. Also it is
  78safest to do your experiments with plain old VGA console. The vesafb
  79and radeonfb (etc) drivers have a tendency to crash the machine during
  80resume.
  81
  82You may have a system where none of above works. At that point you
  83either invent another ugly hack that works, or write proper driver for
  84your video card (good luck getting docs :-(). Maybe suspending from X
  85(proper X, knowing your hardware, not XF68_FBcon) might have better
  86chance of working.
  87
  88Table of known working notebooks:
  89
  90Model                           hack (or "how to do it")
  91------------------------------------------------------------------------------
  92Acer Aspire 1406LC              ole's late BIOS init (7), turn off DRI
  93Acer TM 230                     s3_bios (2)
  94Acer TM 242FX                   vbetool (6)
  95Acer TM C110                    video_post (8)
  96Acer TM C300                    vga=normal (only suspend on console, not in X), vbetool (6) or video_post (8)
  97Acer TM 4052LCi                 s3_bios (2)
  98Acer TM 636Lci                  s3_bios,s3_mode (4)
  99Acer TM 650 (Radeon M7)         vga=normal plus boot-radeon (5) gets text console back
 100Acer TM 660                     ??? (*)
 101Acer TM 800                     vga=normal, X patches, see webpage (5) or vbetool (6)
 102Acer TM 803                     vga=normal, X patches, see webpage (5) or vbetool (6)
 103Acer TM 803LCi                  vga=normal, vbetool (6)
 104Arima W730a                     vbetool needed (6)
 105Asus L2400D                     s3_mode (3)(***) (S1 also works OK)
 106Asus L3350M (SiS 740)           (6)
 107Asus L3800C (Radeon M7)         s3_bios (2) (S1 also works OK)
 108Asus M6887Ne                    vga=normal, s3_bios (2), use radeon driver instead of fglrx in x.org
 109Athlon64 desktop prototype      s3_bios (2)
 110Compal CL-50                    ??? (*)
 111Compaq Armada E500 - P3-700     none (1) (S1 also works OK)
 112Compaq Evo N620c                vga=normal, s3_bios (2)
 113Dell 600m, ATI R250 Lf          none (1), but needs xorg-x11-6.8.1.902-1
 114Dell D600, ATI RV250            vga=normal and X, or try vbestate (6)
 115Dell D610                       vga=normal and X (possibly vbestate (6) too, but not tested)
 116Dell Inspiron 4000              ??? (*)
 117Dell Inspiron 500m              ??? (*)
 118Dell Inspiron 510m              ???
 119Dell Inspiron 5150              vbetool needed (6)
 120Dell Inspiron 600m              ??? (*)
 121Dell Inspiron 8200              ??? (*)
 122Dell Inspiron 8500              ??? (*)
 123Dell Inspiron 8600              ??? (*)
 124eMachines athlon64 machines     vbetool needed (6) (someone please get me model #s)
 125HP NC6000                       s3_bios, may not use radeonfb (2); or vbetool (6)
 126HP NX7000                       ??? (*)
 127HP Pavilion ZD7000              vbetool post needed, need open-source nv driver for X
 128HP Omnibook XE3 athlon version  none (1)
 129HP Omnibook XE3GC               none (1), video is S3 Savage/IX-MV
 130HP Omnibook XE3L-GF             vbetool (6)
 131HP Omnibook 5150                none (1), (S1 also works OK)
 132IBM TP T20, model 2647-44G      none (1), video is S3 Inc. 86C270-294 Savage/IX-MV, vesafb gets "interesting" but X work.
 133IBM 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 :-(]
 134IBM TP R32 / Type 2658-MMG      none (1)
 135IBM TP R40 2722B3G              ??? (*)
 136IBM TP R50p / Type 1832-22U     s3_bios (2)
 137IBM TP R51                      none (1)
 138IBM TP T30      236681A         ??? (*)
 139IBM TP T40 / Type 2373-MU4      none (1)
 140IBM TP T40p                     none (1)
 141IBM TP R40p                     s3_bios (2)
 142IBM TP T41p                     s3_bios (2), switch to X after resume
 143IBM TP T42                      s3_bios (2)
 144IBM ThinkPad T42p (2373-GTG)    s3_bios (2)
 145IBM TP X20                      ??? (*)
 146IBM TP X30                      s3_bios, s3_mode (4)
 147IBM TP X31 / Type 2672-XXH      none (1), use radeontool (http://fdd.com/software/radeon/) to turn off backlight.
 148IBM 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?
 149IBM Thinkpad X40 Type 2371-7JG  s3_bios,s3_mode (4)
 150IBM TP 600e                     none(1), but a switch to console and back to X is needed
 151Medion MD4220                   ??? (*)
 152Samsung P35                     vbetool needed (6)
 153Sharp PC-AR10 (ATI rage)        none (1), backlight does not switch off
 154Sony Vaio PCG-C1VRX/K           s3_bios (2)
 155Sony Vaio PCG-F403              ??? (*)
 156Sony Vaio PCG-GRT995MP          none (1), works with 'nv' X driver
 157Sony Vaio PCG-GR7/K             none (1), but needs radeonfb, use radeontool (http://fdd.com/software/radeon/) to turn off backlight.
 158Sony Vaio PCG-N505SN            ??? (*)
 159Sony Vaio vgn-s260              X or boot-radeon can init it (5)
 160Sony Vaio vgn-S580BH            vga=normal, but suspend from X. Console will be blank unless you return to X.
 161Sony Vaio vgn-FS115B            s3_bios (2),s3_mode (4)
 162Toshiba Libretto L5             none (1)
 163Toshiba Libretto 100CT/110CT    vbetool (6)
 164Toshiba Portege 3020CT          s3_mode (3)
 165Toshiba Satellite 4030CDT       s3_mode (3) (S1 also works OK)
 166Toshiba Satellite 4080XCDT      s3_mode (3) (S1 also works OK)
 167Toshiba Satellite 4090XCDT      ??? (*)
 168Toshiba Satellite P10-554       s3_bios,s3_mode (4)(****)
 169Toshiba M30                     (2) xor X with nvidia driver using internal AGP
 170Uniwill 244IIO                  ??? (*)
 171
 172Known working desktop systems
 173~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 174
 175Mainboard           Graphics card                 hack (or "how to do it")
 176------------------------------------------------------------------------------
 177Asus A7V8X          nVidia RIVA TNT2 model 64     s3_bios,s3_mode (4)
 178
 179
 180(*) from https://wiki.ubuntu.com/HoaryPMResults, not sure
 181    which options to use. If you know, please tell me.
 182
 183(***) To be tested with a newer kernel.
 184
 185(****) Not with SMP kernel, UP only.
 186
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