From: Pavel Machek <pavel@ucw.cz> Update suspend documentation. Signed-off-by: Pavel Machek <pavel@suse.cz> Signed-off-by: Andrew Morton <akpm@osdl.org> --- Documentation/power/swsusp.txt | 7 +++++++ Documentation/power/video.txt | 9 ++++++++- 2 files changed, 15 insertions(+), 1 deletion(-) diff -puN Documentation/power/swsusp.txt~suspend-update-documentation Documentation/power/swsusp.txt --- devel/Documentation/power/swsusp.txt~suspend-update-documentation 2005-07-12 02:13:56.000000000 -0700 +++ devel-akpm/Documentation/power/swsusp.txt 2005-07-12 02:13:56.000000000 -0700 @@ -311,3 +311,10 @@ As a rule of thumb use encrypted swap to system is shut down or suspended. Additionally use the encrypted suspend image to prevent sensitive data from being stolen after resume. + +Q: Why we cannot suspend to a swap file? + +A: Because accessing swap file needs the filesystem mounted, and +filesystem might do something wrong (like replaying the journal) +during mount. [Probably could be solved by modifying every filesystem +to support some kind of "really read-only!" option. Patches welcome.] diff -puN Documentation/power/video.txt~suspend-update-documentation Documentation/power/video.txt --- devel/Documentation/power/video.txt~suspend-update-documentation 2005-07-12 02:13:56.000000000 -0700 +++ devel-akpm/Documentation/power/video.txt 2005-07-12 02:13:56.000000000 -0700 @@ -46,6 +46,12 @@ There are a few types of systems where v 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 mentioned here: + http://bugzilla.kernel.org/show_bug.cgi?id=3670. 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 @@ -64,7 +70,8 @@ Model hack (or ------------------------------------------------------------------------------ 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 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 vga=normal (2) Acer TM 650 (Radeon M7) vga=normal plus boot-radeon (5) gets text console back _