[PATCH] suspend: update documentation
Update suspend documentation. Signed-off-by: Pavel Machek <pavel@suse.cz> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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@ -311,3 +311,10 @@ As a rule of thumb use encrypted swap to protect your data while your
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system is shut down or suspended. Additionally use the encrypted
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suspend image to prevent sensitive data from being stolen after
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resume.
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Q: Why we cannot suspend to a swap file?
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A: Because accessing swap file needs the filesystem mounted, and
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filesystem might do something wrong (like replaying the journal)
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during mount. [Probably could be solved by modifying every filesystem
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to support some kind of "really read-only!" option. Patches welcome.]
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@ -46,6 +46,12 @@ There are a few types of systems where video works after S3 resume:
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POSTing bios works. Ole Rohne has patch to do just that at
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http://dev.gentoo.org/~marineam/patch-radeonfb-2.6.11-rc2-mm2.
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(8) on some systems, you can use the video_post utility mentioned here:
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http://bugzilla.kernel.org/show_bug.cgi?id=3670. Do echo 3 > /sys/power/state
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&& /usr/sbin/video_post - which will initialize the display in console mode.
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If you are in X, you can switch to a virtual terminal and back to X using
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CTRL+ALT+F1 - CTRL+ALT+F7 to get the display working in graphical mode again.
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Now, if you pass acpi_sleep=something, and it does not work with your
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bios, you'll get a hard crash during resume. Be careful. Also it is
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safest to do your experiments with plain old VGA console. The vesafb
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@ -64,7 +70,8 @@ Model hack (or "how to do it")
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------------------------------------------------------------------------------
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Acer Aspire 1406LC ole's late BIOS init (7), turn off DRI
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Acer TM 242FX vbetool (6)
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Acer TM C300 vga=normal (only suspend on console, not in X), vbetool (6)
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Acer TM C110 video_post (8)
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Acer TM C300 vga=normal (only suspend on console, not in X), vbetool (6) or video_post (8)
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Acer TM 4052LCi s3_bios (2)
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Acer TM 636Lci s3_bios vga=normal (2)
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Acer TM 650 (Radeon M7) vga=normal plus boot-radeon (5) gets text console back
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