From mboxrd@z Thu Jan  1 00:00:00 1970
From: Keith Packard <keithp@keithp.com>
Subject: Re: Screen corruption regression from 3.0 to 3.1rc4
Date: Tue, 06 Sep 2011 08:53:39 -0700
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On Tue, 06 Sep 2011 15:11:12 +0200, Philipp Klaus Krause <pkk@spth.de> wrot=
e:

> Here's the output from git-bisect:
>=20
> d74362c9e45689d8d7e3d4bcf6681c4358ef4f2e is the first bad commit
> commit d74362c9e45689d8d7e3d4bcf6681c4358ef4f2e
> Author: Keith Packard <keithp@keithp.com>
> Date:   Thu Jul 28 14:47:14 2011 -0700
>=20
>     drm/i915: Flush other plane register writes
>=20
>     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=3D0

=2D-=20
keith.packard@intel.com

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