Documentation/power/video.txt

   1
   2                 Video issues with S3 resume
   3                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~
   4                   2003-2005, 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 There are a few types of systems where video works after S3 resume:
  19
  20 (1) systems where video state is preserved over S3.
  21
  22 (2) systems where it is possible to call the video BIOS during S3
  23   resume. Unfortunately, it is not correct to call the video BIOS at
  24   that point, but it happens to work on some machines. Use
  25   acpi_sleep=s3_bios.
  26
  27 (3) systems that initialize video card into vga text mode and where
  28   the BIOS works well enough to be able to set video mode. Use
  29   acpi_sleep=s3_mode on these.
  30
  31 (4) on some systems s3_bios kicks video into text mode, and
  32   acpi_sleep=s3_bios,s3_mode is needed.
  33
  34 (5) radeon systems, where X can soft-boot your video card. You'll need
  35   a new enough X, and a plain text console (no vesafb or radeonfb). See
  36   http://www.doesi.gmxhome.de/linux/tm800s3/s3.html for more information.
  37   Alternatively, you should use vbetool (6) instead.
  38
  39 (6) other radeon systems, where vbetool is enough to bring system back
  40   to life. It needs text console to be working. Do vbetool vbestate
  41   save > /tmp/delme; echo 3 > /proc/acpi/sleep; vbetool post; vbetool
  42   vbestate restore < /tmp/delme; setfont <whatever>, and your video
  43   should work.
  44
  45 (7) on some systems, it is possible to boot most of kernel, and then
  46   POSTing bios works. Ole Rohne has patch to do just that at
  47   http://dev.gentoo.org/~marineam/patch-radeonfb-2.6.11-rc2-mm2.
  48
  49 (8) on some systems, you can use the video_post utility mentioned here:
  50   http://bugzilla.kernel.org/show_bug.cgi?id=3670. Do echo 3 > /sys/power/state
  51   && /usr/sbin/video_post - which will initialize the display in console mode.
  52   If  you are in X, you can switch to a virtual terminal and back to X using
  53   CTRL+ALT+F1 - CTRL+ALT+F7 to get the display working in graphical mode again.
  54
  55 Now, if you pass acpi_sleep=something, and it does not work with your
  56 bios, you'll get a hard crash during resume. Be careful. Also it is
  57 safest to do your experiments with plain old VGA console. The vesafb
  58 and radeonfb (etc) drivers have a tendency to crash the machine during
  59 resume.
  60
  61 You may have a system where none of above works. At that point you
  62 either invent another ugly hack that works, or write proper driver for
  63 your video card (good luck getting docs :-(). Maybe suspending from X
  64 (proper X, knowing your hardware, not XF68_FBcon) might have better
  65 chance of working.
  66
  67 Table of known working notebooks:
  68
  69 Model                           hack (or "how to do it")
  70 ------------------------------------------------------------------------------
  71 Acer Aspire 1406LC              ole's late BIOS init (7), turn off DRI
  72 Acer TM 242FX                   vbetool (6)
  73 Acer TM C110                    video_post (8)
  74 Acer TM C300                    vga=normal (only suspend on console, not in X), vbetool (6) or video_post (8)
  75 Acer TM 4052LCi                 s3_bios (2)
  76 Acer TM 636Lci                  s3_bios,s3_mode (4)
  77 Acer TM 650 (Radeon M7)         vga=normal plus boot-radeon (5) gets text console back
  78 Acer TM 660                     ??? (*)
  79 Acer TM 800                     vga=normal, X patches, see webpage (5) or vbetool (6)
  80 Acer TM 803                     vga=normal, X patches, see webpage (5) or vbetool (6)
  81 Acer TM 803LCi                  vga=normal, vbetool (6)
  82 Arima W730a                     vbetool needed (6)
  83 Asus L2400D                     s3_mode (3)(***) (S1 also works OK)
  84 Asus L3350M (SiS 740)           (6)
  85 Asus L3800C (Radeon M7)         s3_bios (2) (S1 also works OK)
  86 Asus M6887Ne                    vga=normal, s3_bios (2), use radeon driver instead of fglrx in x.org
  87 Athlon64 desktop prototype      s3_bios (2)
  88 Compal CL-50                    ??? (*)
  89 Compaq Armada E500 - P3-700     none (1) (S1 also works OK)
  90 Compaq Evo N620c                vga=normal, s3_bios (2)
  91 Dell 600m, ATI R250 Lf          none (1), but needs xorg-x11-6.8.1.902-1
  92 Dell D600, ATI RV250            vga=normal and X, or try vbestate (6)
  93 Dell D610                       vga=normal and X (possibly vbestate (6) too, but not tested)
  94 Dell Inspiron 4000              ??? (*)
  95 Dell Inspiron 500m              ??? (*)
  96 Dell Inspiron 510m              ???
  97 Dell Inspiron 600m              ??? (*)
  98 Dell Inspiron 8200              ??? (*)
  99 Dell Inspiron 8500              ??? (*)
 100 Dell Inspiron 8600              ??? (*)
 101 eMachines athlon64 machines     vbetool needed (6) (someone please get me model #s)
 102 HP NC6000                       s3_bios, may not use radeonfb (2); or vbetool (6)
 103 HP NX7000                       ??? (*)
 104 HP Pavilion ZD7000              vbetool post needed, need open-source nv driver for X
 105 HP Omnibook XE3 athlon version  none (1)
 106 HP Omnibook XE3GC               none (1), video is S3 Savage/IX-MV
 107 IBM TP T20, model 2647-44G      none (1), video is S3 Inc. 86C270-294 Savage/IX-MV, vesafb gets "interesting" but X work.
 108 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 :-(]
 109 IBM TP R32 / Type 2658-MMG      none (1)
 110 IBM TP R40 2722B3G              ??? (*)
 111 IBM TP R50p / Type 1832-22U     s3_bios (2)
 112 IBM TP R51                      none (1)
 113 IBM TP T30      236681A         ??? (*)
 114 IBM TP T40 / Type 2373-MU4      none (1)
 115 IBM TP T40p                     none (1)
 116 IBM TP R40p                     s3_bios (2)
 117 IBM TP T41p                     s3_bios (2), switch to X after resume
 118 IBM TP T42                      s3_bios (2)
 119 IBM ThinkPad T42p (2373-GTG)    s3_bios (2)
 120 IBM TP X20                      ??? (*)
 121 IBM TP X30                      s3_bios (2)
 122 IBM TP X31 / Type 2672-XXH      none (1), use radeontool (http://fdd.com/software/radeon/) to turn off backlight.
 123 IBM TP X32                      none (1), but backlight is on and video is trashed after long suspend
 124 IBM Thinkpad X40 Type 2371-7JG  s3_bios,s3_mode (4)
 125 Medion MD4220                   ??? (*)
 126 Samsung P35                     vbetool needed (6)
 127 Sharp PC-AR10 (ATI rage)        none (1)
 128 Sony Vaio PCG-C1VRX/K           s3_bios (2)
 129 Sony Vaio PCG-F403              ??? (*)
 130 Sony Vaio PCG-N505SN            ??? (*)
 131 Sony Vaio vgn-s260              X or boot-radeon can init it (5)
 132 Toshiba Libretto L5             none (1)
 133 Toshiba Satellite 4030CDT       s3_mode (3)
 134 Toshiba Satellite 4080XCDT      s3_mode (3)
 135 Toshiba Satellite 4090XCDT      ??? (*)
 136 Toshiba Satellite P10-554       s3_bios,s3_mode (4)(****)
 137 Toshiba M30                     (2) xor X with nvidia driver using internal AGP
 138 Uniwill 244IIO                  ??? (*)
 139
 140 Known working desktop systems
 141 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 142
 143 Mainboard           Graphics card                 hack (or "how to do it")
 144 ------------------------------------------------------------------------------
 145 Asus A7V8X          nVidia RIVA TNT2 model 64     s3_bios,s3_mode (4)
 146
 147
 148 (*) from http://www.ubuntulinux.org/wiki/HoaryPMResults, not sure
 149     which options to use. If you know, please tell me.
 150
 151 (***) To be tested with a newer kernel.
 152
 153 (****) Not with SMP kernel, UP only.
 154
 155 VBEtool details
 156 ~~~~~~~~~~~~~~~
 157 (with thanks to Carl-Daniel Hailfinger)
 158
 159 First, boot into X and run the following script ONCE:
 160 #!/bin/bash
 161 statedir=/root/s3/state
 162 mkdir -p $statedir
 163 chvt 2
 164 sleep 1
 165 vbetool vbestate save >$statedir/vbe
 166
 167
 168 To suspend and resume properly, call the following script as root:
 169 #!/bin/bash
 170 statedir=/root/s3/state
 171 curcons=`fgconsole`
 172 fuser /dev/tty$curcons 2>/dev/null|xargs ps -o comm= -p|grep -q X && chvt 2
 173 cat /dev/vcsa >$statedir/vcsa
 174 sync
 175 echo 3 >/proc/acpi/sleep
 176 sync
 177 vbetool post
 178 vbetool vbestate restore <$statedir/vbe
 179 cat $statedir/vcsa >/dev/vcsa
 180 rckbd restart
 181 chvt $[curcons%6+1]
 182 chvt $curcons
 183
 184
 185 Unless you change your graphics card or other hardware configuration,
 186 the state once saved will be OK for every resume afterwards.
 187 NOTE: The "rckbd restart" command may be different for your
 188 distribution. Simply replace it with the command you would use to
 189 set the fonts on screen.