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    SubjectRe: ACPI crash on lid close - SMP race?
    Hi, About this _DOS , I reported this problem a long time ago, which now
    is on
    Could you put yours comment on it ?

    On fedora stock kernel, appears one patch, (Now I see that you are the
    author :) )

    I tested your patch and it works for me !

    Disable ACPI video display switching by default

    -- mjg59

    diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
    index bac2901..93b1a9e 100644
    --- a/drivers/acpi/video.c
    +++ b/drivers/acpi/video.c
    @@ -1818,7 +1818,7 @@ static int acpi_video_bus_put_devices(struct acpi_video_bus *video)

    static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
    - return acpi_video_bus_DOS(video, 0, 0);
    + return acpi_video_bus_DOS(video, 3, 1);

    static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)

    On Mon, 2008-11-10 at 16:11 +0000, Matthew Garrett wrote:
    > If the _DOS flag on my HP 2510p is set to 0 (ie, signal OS when screen
    > notification is requested, don't change automatically) then it'll crash
    > on random lid open/closes. The trace generally makes little sense and
    > depends on the kernel version and phase of the moon. I'd ignored this as
    > firmware brokenness up until lately, but since having _DOS set to 0 is
    > the only way to get a notification when the display switch key is
    > pressed on this machine I'd be interested in fixing it properly.
    > Unfortunately, I've got no real idea what on earth is going on. The only
    > clue I've found so far is that booting with maxcpus=1 leaves it working
    > perfectly. What parts of the ACPI stack could be triggering this?
    Sérgio M. B.
    [unhandled content-type:application/x-pkcs7-signature]
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      Last update: 2008-11-10 18:29    [W:0.022 / U:234.204 seconds]
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