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

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Message-ID: <20120122102912.GA2123@nbgentoo>
Date:	Sun, 22 Jan 2012 11:29:12 +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, 12:53:00, Keith Packard wrote:
> On Sat, 21 Jan 2012 19:44:53 +0100, Lubos Kolouch <lubos.kolouch@...il.com> wrote:
> 
> > dmesg after boot - http://paste.pocoo.org/show/538343/
> > dmesg after failed resume -  http://paste.pocoo.org/show/538344/
> 
> Ok, that's weird -- we're choosing a different display port link speed
> on resume than at boot time. I have a theory that intel_dp_mode_fixup is
> accidentally using the current bpp value when computing the values
> needed for the new mode, and that this value may differ between boot and
> resume.
> 
> Here's a patch to dump some debug info out to test this theory.
> 

Thanks, here you go:
dmesg after boot - http://paste.pocoo.org/show/538625/
dmesg after failed resume - http://paste.pocoo.org/show/538626/

Lubos
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