From mboxrd@z Thu Jan  1 00:00:00 1970
From: Kenneth Graunke <kenneth@whitecape.org>
Subject: Re: Question about how to troubleshoot sandybridge
 kernel opps and subsequest GPU lockup
Date: Mon, 24 Oct 2011 19:43:44 -0700
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On 10/24/2011 05:58 PM, James R. Leu wrote:
> Debug output attached

You're in luck!  I fixed this GPU hang today in Mesa master.

This commit fixes the hang:

commit 3cc0a7be23ab603ed40d602595f673a44e079885
Author: Kenneth Graunke <kenneth@whitecape.org>
Date:   Fri Oct 21 01:03:37 2011 -0700

    i965: Apply post-sync non-zero workaround to homebrew workaround.

    In commit 3e5d3626, Eric added a homebrew workaround to fix GPU hangs in
    the Mesa "engine" demo and oglc's api-texcoord test.

    Unfortunately, his PIPE_CONTROL contains a Depth Stall, which
    necessitates the post-sync non-zero workaround,

    Fixes GPU hangs in Civilization 4, PlaneShift, and 3DMMES.
    Hopefully Heroes of Newerth as well, though I haven't tested that.

    NOTE: This is candidate for the 7.11 branch.

    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=40324
    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=41096
    Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
    Reviewed-and-tested-by: Eric Anholt <eric@anholt.net>

I'm planning on cherry-picking it to the 7.11 branch in the next few
days, so it ought to make the upcoming 7.11.1 release.