[Intel-gfx] Screen corruption regression from 3.0 to 3.1rc4

[Philipp Klaus Krause]

-----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 at spth.de> wrote:
> 
>> Here's the output from git-bisect:
>>
>> d74362c9e45689d8d7e3d4bcf6681c4358ef4f2e is the first bad commit
>> commit d74362c9e45689d8d7e3d4bcf6681c4358ef4f2e
>> Author: Keith Packard <keithp at 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-----