linux-kernel - Re: Suspend/resume regression in Toshiba A11 since 2.6.34-rc4

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Date:	Sat, 19 Mar 2011 12:35:34 -0300
From:	Herton Ronaldo Krzesinski <herton.krzesinski@...onical.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Suspend/resume regression in Toshiba A11 since 2.6.34-rc4

On Fri, Mar 18, 2011 at 11:38:52PM +0100, Rafael J. Wysocki wrote:
> On Friday, March 18, 2011, Herton Ronaldo Krzesinski wrote:
> > This regression is old, but discovered recently. Since 2.6.34-rc4,
> > a Toshiba Tecra A11 machine resumes without video for the first time.
> > Here is the strange thing reported, on the first suspend/resume, when
> > the machine wakes up the video is blank, but the machine is up (just the
> > screen is black). If you suspend again, on second resume the video comes
> > back normally.
> > 
> > Helping the reporter bisecting the problem, we narrowed down the bug to
> > this commit:
> > 
> > commit ac7729da880e742613129ee6dea0045328670d2d
> > Author: Rafael J. Wysocki <rjw@...k.pl>
> > Date:   Mon Apr 5 01:43:51 2010 +0200
> > 
> >     ACPI / PM: Move ACPI video resume to a PM notifier
> > 
> > And reverting this commit on 2.6.38 still made the problem go away.
> > Looking at the commit above I don't saw any problem, and perhaps we have
> > some bad bios here which by moving the resume of acpi video later
> > triggers this bug. Also strange that on second suspend/resume everything
> > is normal... (the regression here is just the video is blank on first
> > resume).
> > 
> > I asked the reporter to try to increase brightness logged in remotely
> > when the video is blank after first resume, but this didn't have any
> > effect.
> > 
> > This was reported in https://bugs.launchpad.net/bugs/719620 (if reading
> > I recommend to skip to comment #58 and later), I can't think of any
> > solution besides trying to move acpi video resume perhaps back and
> > depend on video device being resume first. I asked for more debugging
> > information but got nothing unfortunately which could diagnose better
> > this...
> 
> What graphics driver is used?

i915

> 
> Rafael
> 

-- 
[]'s
Herton
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