X server froze (97e3fc1) (was: Re: i915: "BUG ON: obj->base.write_domain & ~I915_GEM_GPU_DOMAINS" fixed!)

[Masachika ISHIZUKA]

  Hello, Jean.

  Although it is very rare (but 3 times within 10 minutes when
switching fullscreen mode and window mode quickly of mplayer),
X server on 97e3fc1 was froren and I cannot terminate X server.
I can still login from another machine but 'kill -9 (PID of X)'
is not terminate X. 'ps ax' shows the CPU time of X is increasing.
  I can shutdown/reboot but no log is recorded.
-- 
Masachika ISHIZUKA