linux-kernel - Re: Linux 2.6.37

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Message-ID: <20110111174434.GB3988@tiehlicka.suse.cz>
Date:	Tue, 11 Jan 2011 18:44:34 +0100
From:	Michal Hocko <mhocko@...e.cz>
To:	Chris Wilson <chris@...is-wilson.co.uk>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	dri-devel@...ts.freedesktop.org, indan@....nu
Subject: Re: Linux 2.6.37

On Tue 11-01-11 17:39:42, Chris Wilson wrote:
> On Tue, 11 Jan 2011 18:19:17 +0100, Michal Hocko <mhocko@...e.cz> wrote:
> > [Let's CC Indan - author of the bugzilla patches]
> > 
> > On Thu 06-01-11 11:48:16, Michal Hocko wrote:
> > > Hi,
> > > 
> > > On Tue 04-01-11 17:15:45, Linus Torvalds wrote:
> > > [...]
> > > > We did have another revert to fix hopefullythe last "blank screen"
> > > > regression on intel graphics.
> > > 
> > > It seems that there is still a regression for intel graphic cards
> > > backlight. One report is https://bugzilla.kernel.org/show_bug.cgi?id=22672.
> > > I can reproduce the problem easily by:
> > > xset dpms force standby; sleep 3s; xset dpms force on
> > > 
> > > backlight doesn't get up (there is really dark picture though which
> > > doesn't get brighter by function keys which work normally) after dpms on
> > > until I close and open lid. 
> > > 
> > > The problem wasn't present in 2.6.36
> > 
> > I can confirm that this problem is not present if both patches from
> > bko#22672 are applied on top of 2.6.37 kernel.
> > I haven't tried both patches separately, but I can surely try it if it
> > makes any sense.
> 
> The second patch is wrong in that it will prevent changing resolutions
> using the panel fitter. The first patch looks along the right lines, just
> misses the possibility that the backlight can be modified by other means.
> 
> So hopefully, you just need the first patch.

I would have bet I have tested the 1st patch but let me double check.
The 2nd patch alone doesn't fix the problem.

> -Chris
> 
> -- 
> Chris Wilson, Intel Open Source Technology Centre

-- 
Michal Hocko
L3 team 
SUSE LINUX s.r.o.
Lihovarska 1060/12
190 00 Praha 9    
Czech Republic
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