linux-kernel - Re: ACPI crash on lid close

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Date:	Mon, 10 Nov 2008 23:52:53 +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?

On Mon, 2008-11-10 at 17:29 +0000, Matthew Garrett wrote:
> On Mon, Nov 10, 2008 at 05:26:35PM +0000, Sergio Monteiro Basto wrote:
> > 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 ! 
> 
> Yeah, that's the "safe" patch which stops us executing the codepath that 
> breaks, but also means I don't get display switch events. Having it set 
> to 1 means executing BIOS code that's likely to interfere with the rest 
> of the system, so a crash isn't surprising. 

Are you talking about 1st or 2nd parameter ? 
I prefer 
"return acpi_video_bus_DOS(video, 1, 0);" (which is the original code,
before last change on kernel vanilla) 

> But a setting of 0 *should* 
> be safe, and I'm quite confused as to why it's exploding.

The second parameter ? 
I got some instability (after resume from disk) with a
kernel-2.6.27.4-79, which have yours patch, but I am far to be sure that
is related. 

Thanks, 
-- 
Sérgio M. B.

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