linux-kernel - Re: i915 wakes from suspend to RAM with blank screen after commit cd9dde44f47501394b9f0715b6a36a92aa74c0d0

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Message-ID: <20120121184453.GA2698@nbgentoo>
Date:	Sat, 21 Jan 2012 19:44:53 +0100
From:	Lubos Kolouch <lubos.kolouch@...il.com>
To:	Keith Packard <keithp@...thp.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: i915 wakes from suspend to RAM with blank screen after commit
 cd9dde44f47501394b9f0715b6a36a92aa74c0d0

On Sat, Jan 21, 2012, 10:15:24, Keith Packard wrote:
> On Sat, 21 Jan 2012 10:32:14 +0000 (UTC), Lubos Kolouch <lubos.kolouch@...il.com> wrote:
> 
> > I git bisected it to commit
> > cd9dde44f47501394b9f0715b6a36a92aa74c0d0 is the first bad commit
> > commit cd9dde44f47501394b9f0715b6a36a92aa74c0d0
> > Author: Adam Jackson <ajax@...hat.com>
> > Date:   Fri Oct 14 12:43:49 2011 -0400
> 
> Did you try reverting this single commit on top of 3.3-rc1?
> 
> And, can you collect the dmesg output with the kernel parameter drm.debug=0xe
> added to the boot line, both messages at boot time *and* messages during
> resume would be needed. If it works at boot time, I'm quite surprised it
> somehow doesn't work at resume...

I tried now and when I revert this line :

- return (pixel_clock * bpp + 7) / 8;
+ return (pixel_clock * bpp + 9) / 10;

resume works OK for me with 3.3-rc1.

Before change (failed)
----------------------
dmesg after boot - http://paste.pocoo.org/show/538343/
dmesg after failed resume -  http://paste.pocoo.org/show/538344/

After change (OK)
-----------------
dmesg after boot - http://paste.pocoo.org/show/538345/
dmesg after OK resume - http://paste.pocoo.org/show/538346/

Luboš Kolouch
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