Documentation/power/video.txt

   1
   2                 Video issues with S3 resume
   3                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~
   4                   2003-2006, Pavel Machek
   5
   6 During S3 resume, hardware needs to be reinitialized. For most
   7 devices, this is easy, and kernel driver knows how to do
   8 it. Unfortunately there's one exception: video card. Those are usually
   9 initialized by BIOS, and kernel does not have enough information to
  10 boot video card. (Kernel usually does not even contain video card
  11 driver -- vesafb and vgacon are widely used).
  12
  13 This is not problem for swsusp, because during swsusp resume, BIOS is
  14 run normally so video card is normally initialized. It should not be
  15 problem for S1 standby, because hardware should retain its state over
  16 that.
  17
  18 We either have to run video BIOS during early resume, or interpret it
  19 using vbetool later, or maybe nothing is neccessary on particular
  20 system because video state is preserved. Unfortunately different
  21 methods work on different systems, and no known method suits all of
  22 them.
  23
  24 Userland application called s2ram has been developed; it contains long
  25 whitelist of systems, and automatically selects working method for a
  26 given system. It can be downloaded from CVS at
  27 www.sf.net/projects/suspend . If you get a system that is not in the
  28 whitelist, please try to find a working solution, and submit whitelist
  29 entry so that work does not need to be repeated.
  30
  31 Currently, VBE_SAVE method (6 below) works on most
  32 systems. Unfortunately, vbetool only runs after userland is resumed,
  33 so it makes debugging of early resume problems
  34 hard/impossible. Methods that do not rely on userland are preferable.
  35
  36 Details
  37 ~~~~~~~
  38
  39 There 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 mentioned here:
  71   http://bugzilla.kernel.org/show_bug.cgi?id=3670. Do echo 3 > /sys/power/state
  72   && /usr/sbin/video_post - which will initialize the display in console mode.
  73   If  you are in X, you can switch to a virtual terminal and back to X using
  74   CTRL+ALT+F1 - CTRL+ALT+F7 to get the display working in graphical mode again.
  75
  76 Now, if you pass acpi_sleep=something, and it does not work with your
  77 bios, you'll get a hard crash during resume. Be careful. Also it is
  78 safest to do your experiments with plain old VGA console. The vesafb
  79 and radeonfb (etc) drivers have a tendency to crash the machine during
  80 resume.
  81
  82 You may have a system where none of above works. At that point you
  83 either invent another ugly hack that works, or write proper driver for
  84 your video card (good luck getting docs :-(). Maybe suspending from X
  85 (proper X, knowing your hardware, not XF68_FBcon) might have better
  86 chance of working.
  87
  88 Table of known working notebooks:
  89
  90 Model                           hack (or "how to do it")
  91 ------------------------------------------------------------------------------
  92 Acer Aspire 1406LC              ole's late BIOS init (7), turn off DRI
  93 Acer TM 242FX                   vbetool (6)
  94 Acer TM C110                    video_post (8)
  95 Acer TM C300                    vga=normal (only suspend on console, not in X), vbetool (6) or video_post (8)
  96 Acer TM 4052LCi                 s3_bios (2)
  97 Acer TM 636Lci                  s3_bios,s3_mode (4)
  98 Acer TM 650 (Radeon M7)         vga=normal plus boot-radeon (5) gets text console back
  99 Acer TM 660                     ??? (*)
 100 Acer TM 800                     vga=normal, X patches, see webpage (5) or vbetool (6)
 101 Acer TM 803                     vga=normal, X patches, see webpage (5) or vbetool (6)
 102 Acer TM 803LCi                  vga=normal, vbetool (6)
 103 Arima W730a                     vbetool needed (6)
 104 Asus L2400D                     s3_mode (3)(***) (S1 also works OK)
 105 Asus L3350M (SiS 740)           (6)
 106 Asus L3800C (Radeon M7)         s3_bios (2) (S1 also works OK)
 107 Asus M6887Ne                    vga=normal, s3_bios (2), use radeon driver instead of fglrx in x.org
 108 Athlon64 desktop prototype      s3_bios (2)
 109 Compal CL-50                    ??? (*)
 110 Compaq Armada E500 - P3-700     none (1) (S1 also works OK)
 111 Compaq Evo N620c                vga=normal, s3_bios (2)
 112 Dell 600m, ATI R250 Lf          none (1), but needs xorg-x11-6.8.1.902-1
 113 Dell D600, ATI RV250            vga=normal and X, or try vbestate (6)
 114 Dell D610                       vga=normal and X (possibly vbestate (6) too, but not tested)
 115 Dell Inspiron 4000              ??? (*)
 116 Dell Inspiron 500m              ??? (*)
 117 Dell Inspiron 510m              ???
 118 Dell Inspiron 600m              ??? (*)
 119 Dell Inspiron 8200              ??? (*)
 120 Dell Inspiron 8500              ??? (*)
 121 Dell Inspiron 8600              ??? (*)
 122 eMachines athlon64 machines     vbetool needed (6) (someone please get me model #s)
 123 HP NC6000                       s3_bios, may not use radeonfb (2); or vbetool (6)
 124 HP NX7000                       ??? (*)
 125 HP Pavilion ZD7000              vbetool post needed, need open-source nv driver for X
 126 HP Omnibook XE3 athlon version  none (1)
 127 HP Omnibook XE3GC               none (1), video is S3 Savage/IX-MV
 128 HP Omnibook 5150                none (1), (S1 also works OK)
 129 IBM TP T20, model 2647-44G      none (1), video is S3 Inc. 86C270-294 Savage/IX-MV, vesafb gets "interesting" but X work.
 130 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 :-(]
 131 IBM TP R32 / Type 2658-MMG      none (1)
 132 IBM TP R40 2722B3G              ??? (*)
 133 IBM TP R50p / Type 1832-22U     s3_bios (2)
 134 IBM TP R51                      none (1)
 135 IBM TP T30      236681A         ??? (*)
 136 IBM TP T40 / Type 2373-MU4      none (1)
 137 IBM TP T40p                     none (1)
 138 IBM TP R40p                     s3_bios (2)
 139 IBM TP T41p                     s3_bios (2), switch to X after resume
 140 IBM TP T42                      s3_bios (2)
 141 IBM ThinkPad T42p (2373-GTG)    s3_bios (2)
 142 IBM TP X20                      ??? (*)
 143 IBM TP X30                      s3_bios, s3_mode (4)
 144 IBM TP X31 / Type 2672-XXH      none (1), use radeontool (http://fdd.com/software/radeon/) to turn off backlight.
 145 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?
 146 IBM Thinkpad X40 Type 2371-7JG  s3_bios,s3_mode (4)
 147 IBM TP 600e                     none(1), but a switch to console and back to X is needed
 148 Medion MD4220                   ??? (*)
 149 Samsung P35                     vbetool needed (6)
 150 Sharp PC-AR10 (ATI rage)        none (1), backlight does not switch off
 151 Sony Vaio PCG-C1VRX/K           s3_bios (2)
 152 Sony Vaio PCG-F403              ??? (*)
 153 Sony Vaio PCG-GRT995MP          none (1), works with 'nv' X driver
 154 Sony Vaio PCG-GR7/K             none (1), but needs radeonfb, use radeontool (http://fdd.com/software/radeon/) to turn off backlight.
 155 Sony Vaio PCG-N505SN            ??? (*)
 156 Sony Vaio vgn-s260              X or boot-radeon can init it (5)
 157 Sony Vaio vgn-S580BH            vga=normal, but suspend from X. Console will be blank unless you return to X.
 158 Sony Vaio vgn-FS115B            s3_bios (2),s3_mode (4)
 159 Toshiba Libretto L5             none (1)
 160 Toshiba Portege 3020CT          s3_mode (3)
 161 Toshiba Satellite 4030CDT       s3_mode (3) (S1 also works OK)
 162 Toshiba Satellite 4080XCDT      s3_mode (3) (S1 also works OK)
 163 Toshiba Satellite 4090XCDT      ??? (*)
 164 Toshiba Satellite P10-554       s3_bios,s3_mode (4)(****)
 165 Toshiba M30                     (2) xor X with nvidia driver using internal AGP
 166 Uniwill 244IIO                  ??? (*)
 167
 168 Known working desktop systems
 169 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 170
 171 Mainboard           Graphics card                 hack (or "how to do it")
 172 ------------------------------------------------------------------------------
 173 Asus A7V8X          nVidia RIVA TNT2 model 64     s3_bios,s3_mode (4)
 174
 175
 176 (*) from http://www.ubuntulinux.org/wiki/HoaryPMResults, not sure
 177     which options to use. If you know, please tell me.
 178
 179 (***) To be tested with a newer kernel.
 180
 181 (****) Not with SMP kernel, UP only.