From mboxrd@z Thu Jan  1 00:00:00 1970
From: Philipp Klaus Krause <pkk@spth.de>
Subject: Re: Screen corruption regression from 3.0 to 3.1rc4
Date: Wed, 07 Sep 2011 19:16:44 +0200
Message-ID: <4E67A6FC.5030405@spth.de>
References: <4E5DD7FA.9000103@spth.de> <4E61F3D8.4080306@spth.de>
	<CAKMK7uGf4qZ+E87aqX6KaZeksfj-irRA5YL+w8dwcOJHSkpT+g@mail.gmail.com>
	<4E6206D6.2010709@spth.de> <4E661BF0.1040806@spth.de>
	<yunfwk9ekfw.fsf@aiko.keithp.com>
Mime-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit
Return-path: <intel-gfx-bounces+gcfxdi-intel-gfx=m.gmane.org@lists.freedesktop.org>
Received: from smtp2.informatik.uni-freiburg.de
	(mx2.informatik.uni-freiburg.de [132.230.150.5])
	by gabe.freedesktop.org (Postfix) with ESMTP id C12B9A0AC2
	for <intel-gfx@lists.freedesktop.org>;
	Wed,  7 Sep 2011 10:16:52 -0700 (PDT)
In-Reply-To: <yunfwk9ekfw.fsf@aiko.keithp.com>
List-Unsubscribe: <http://lists.freedesktop.org/mailman/options/intel-gfx>,
	<mailto:intel-gfx-request@lists.freedesktop.org?subject=unsubscribe>
List-Archive: <http://lists.freedesktop.org/archives/intel-gfx>
List-Post: <mailto:intel-gfx@lists.freedesktop.org>
List-Help: <mailto:intel-gfx-request@lists.freedesktop.org?subject=help>
List-Subscribe: <http://lists.freedesktop.org/mailman/listinfo/intel-gfx>,
	<mailto:intel-gfx-request@lists.freedesktop.org?subject=subscribe>
Sender: intel-gfx-bounces+gcfxdi-intel-gfx=m.gmane.org@lists.freedesktop.org
Errors-To: intel-gfx-bounces+gcfxdi-intel-gfx=m.gmane.org@lists.freedesktop.org
To: Keith Packard <keithp@keithp.com>
Cc: intel-gfx@lists.freedesktop.org
List-Id: intel-gfx@lists.freedesktop.org

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Am 06.09.2011 17:53, schrieb Keith Packard:
> On Tue, 06 Sep 2011 15:11:12 +0200, Philipp Klaus Krause <pkk@spth.de> wrote:
> 
>> Here's the output from git-bisect:
>>
>> d74362c9e45689d8d7e3d4bcf6681c4358ef4f2e is the first bad commit
>> commit d74362c9e45689d8d7e3d4bcf6681c4358ef4f2e
>> Author: Keith Packard <keithp@keithp.com>
>> Date:   Thu Jul 28 14:47:14 2011 -0700
>>
>>     drm/i915: Flush other plane register writes
>>
>>     Writes to the plane control register are buffered in the chip until a
>>     write to the DSPADDR (pre-965) or DSPSURF (post-965) register
>>     occurs.
> 
> Makes me wonder if this is some interaction between page flipping and
> frame buffer compression. Could you try turning it off with the
> following kernel command line parameter?
> 
>         i915.i915_enable_fbc=0
> 

The problem goes away with i915.i915_enable_fbc=0. I'll probably use
that workaround  until the issue is fixed.

Philipp
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.11 (GNU/Linux)
Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/

iEYEARECAAYFAk5npvkACgkQbtUV+xsoLpoRPACguEnn/k9CBlIxXBNVhD1cO1/B
tfEAn0udhnXMKnop2i1cEY8SztLN6RZT
=TjEO
-----END PGP SIGNATURE-----