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authorPavel Machek <pavel@ucw.cz>2005-09-03 15:56:56 -0700
committerLinus Torvalds <torvalds@evo.osdl.org>2005-09-05 00:06:14 -0700
commit7e958883bced7e435f5a76349e15684858d3477c (patch)
treed5b5a670c5917825ac08a67cb9efd0e64afe9799
parent7dc24db1757f950f8bd21b7191106d4bf5134be7 (diff)
[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>
-rw-r--r--Documentation/power/swsusp.txt7
-rw-r--r--Documentation/power/video.txt9
2 files changed, 15 insertions, 1 deletions
diff --git a/Documentation/power/swsusp.txt b/Documentation/power/swsusp.txt
index 7a6b7896645..ddf907fbcc0 100644
--- a/Documentation/power/swsusp.txt
+++ b/Documentation/power/swsusp.txt
@@ -311,3 +311,10 @@ As a rule of thumb use encrypted swap to protect your data while your
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 --git a/Documentation/power/video.txt b/Documentation/power/video.txt
index 7a4a5036d12..1a44e8acb54 100644
--- a/Documentation/power/video.txt
+++ b/Documentation/power/video.txt
@@ -46,6 +46,12 @@ There are a few types of systems where video works after S3 resume:
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 "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 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