Hi, About this _DOS , I reported this problem a long time ago, which now is on http://bugzilla.kernel.org/show_bug.cgi?id=6001 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 ! linux-2.6-acpi-video-dos.patch 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.
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