linux-kernel - Re: ACPI crash on lid close

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Date:	Mon, 10 Nov 2008 17:26:35 +0000
From:	Sergio Monteiro Basto <sergio@...giomb.no-ip.org>
To:	Matthew Garrett <mjg59@...f.ucam.org>
Cc:	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: ACPI crash on lid close - SMP race?

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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