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    Subject[patch] suspend: update documentation
    Update suspend documentation.

    Signed-off-by: Pavel Machek <>

    commit 8972d0ff145879e53416ac77c4cd096fd3cfe227
    tree f901592e816f4cfae7383f443b21a13f67a644f8
    parent a6500a8820a9b271105fe92e5d3013f7c2875b44
    author <pavel@amd.(none)> Tue, 12 Jul 2005 11:04:31 +0200
    committer <pavel@amd.(none)> Tue, 12 Jul 2005 11:04:31 +0200

    Documentation/power/swsusp.txt | 7 +++++++
    Documentation/power/video.txt | 9 ++++++++-
    2 files changed, 15 insertions(+), 1 deletions(-)

    diff --git a/Documentation/power/swsusp.txt b/Documentation/power/swsusp.txt
    --- a/Documentation/power/swsusp.txt
    +++ b/Documentation/power/swsusp.txt
    @@ -318,3 +318,10 @@ 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
    +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
    --- a/Documentation/power/video.txt
    +++ b/Documentation/power/video.txt
    @@ -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

    +(8) on some systems, you can use the video_post utility mentioned here:
    + 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
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