For completeness, I should add that the upstream fix introduces another
bug which may cause some corruption. This one is fixed in this commit:

commit dc3bfebcf77d943b7e8495d30d0ee3d01b3042a5
Author: Chris Wilson <ch...@chris-wilson.co.uk>
Date:   Thu Dec 30 18:02:21 2010 +0000

   drm/i915: Don't skip ring flushes if only invalidating

   Commit 15056d2 tried to optimize away a flush if there were no
   outstanding writes on a ring (in order to prevent a too-early-flush
   during ring init). However, this has the unfortunate side-effect of
   eliminating the texture cache invalidation, and so causing rendering
   artefacts.

   Reported-by: Alexey Fisher <bug-tr...@fisher-privat.net>
   Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>

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Title:
  MASTER: [i845] GPU lockup (apport-crash) (Should KMS be blacklisted?)

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