Upstream feels this kernel patch resolves the issue:
commit c501ae7f332cdaf42e31af30b72b4b66cbbb1604
Author: Chris Wilson <ch...@chris-wilson.co.uk>
Date: Wed Dec 14 13:57:23 2011 +0100
drm/i915: Only clear the GPU domains upon a successful finish
By clearing the GPU read domains before waiting upon the buffer, we run
the risk of the wait being interrupted and the domains prematurely
cleared. The next time we attempt to wait upon the buffer (after
userspace handles the signal), we believe that the buffer is idle and so
skip the wait.
There are a number of bugs across all generations which show signs of an
overly haste reuse of active buffers.
** Also affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags added: kernel-handoff-graphics
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https://bugs.launchpad.net/bugs/982410
Title:
[sandybridge-gt1] False GPU lockup render.IPEHR: 0x7a000003
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