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diff --git a/Documentation/power/video.txt b/Documentation/power/video.txt new file mode 100644 index 0000000..8686968 --- /dev/null +++ b/Documentation/power/video.txt @@ -0,0 +1,169 @@ + + Video issues with S3 resume + ~~~~~~~~~~~~~~~~~~~~~~~~~~~ + 2003-2005, 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. S3 has absolutely +no chance of working with SMP/HT. Be sure it to turn it off before +testing (swsusp should work ok, OTOH). + +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 + new enough X, and plain text console (no vesafb or radeonfb), see + http://www.doesi.gmxhome.de/linux/tm800s3/s3.html. Actually you + should probably 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. + +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 +resume. + +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 systems: + +Model hack (or "how to do it") +------------------------------------------------------------------------------ +Acer Aspire 1406LC ole's late BIOS init (7), turn off DRI +Acer TM 242FX vbetool (6) +Acer TM C300 vga=normal (only suspend on console, not in X), vbetool (6) +Acer TM 4052LCi s3_bios (2) +Acer TM 636Lci s3_bios vga=normal (2) +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 L3800C (Radeon M7) s3_bios (2) (S1 also works OK) +Asus M6NE ??? (*) +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-x11-6.8.1.902-1 +Dell D600, ATI RV250 vga=normal and X, or try vbestate (6) +Dell Inspiron 4000 ??? (*) +Dell Inspiron 500m ??? (*) +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 +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 ??? (*) +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 ??? (*) +IBM ThinkPad T42p (2373-GTG) s3_bios (2) +IBM TP X20 ??? (*) +IBM TP X30 ??? (*) +IBM TP X31 / Type 2672-XXH none (1), use radeontool (http://fdd.com/software/radeon/) to turn off backlight. +IBM Thinkpad X40 Type 2371-7JG s3_bios,s3_mode (4) +Medion MD4220 ??? (*) +Samsung P35 vbetool needed (6) +Sharp PC-AR10 (ATI rage) none (1) +Sony Vaio PCG-F403 ??? (*) +Sony Vaio PCG-N505SN ??? (*) +Sony Vaio vgn-s260 X or boot-radeon can init it (5) +Toshiba Libretto L5 none (1) +Toshiba Satellite 4030CDT s3_mode (3) +Toshiba Satellite 4080XCDT s3_mode (3) +Toshiba Satellite 4090XCDT ??? (*) +Toshiba Satellite P10-554 s3_bios,s3_mode (4)(****) +Uniwill 244IIO ??? (*) + + +(*) from http://www.ubuntulinux.org/wiki/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. + +VBEtool details +~~~~~~~~~~~~~~~ +(with thanks to Carl-Daniel Hailfinger) + +First, boot into X and run the following script ONCE: +#!/bin/bash +statedir=/root/s3/state +mkdir -p $statedir +chvt 2 +sleep 1 +vbetool vbestate save >$statedir/vbe + + +To suspend and resume properly, call the following script as root: +#!/bin/bash +statedir=/root/s3/state +curcons=`fgconsole` +fuser /dev/tty$curcons 2>/dev/null|xargs ps -o comm= -p|grep -q X && chvt 2 +cat /dev/vcsa >$statedir/vcsa +sync +echo 3 >/proc/acpi/sleep +sync +vbetool post +vbetool vbestate restore <$statedir/vbe +cat $statedir/vcsa >/dev/vcsa +rckbd restart +chvt $[curcons%6+1] +chvt $curcons + + +Unless you change your graphics card or other hardware configuration, +the state once saved will be OK for every resume afterwards. +NOTE: The "rckbd restart" command may be different for your +distribution. Simply replace it with the command you would use to +set the fonts on screen. |
