Hi Bryce. After reading your message, I disabled the options:

#Option "AccelMethod" "exa"
#Option "MigrationHeuristic" "greedy"
#Option "ExaNoComposite" "true"

And I had a crash shortly after. If exa accel and greedy are default now
with xserver-xorg-video-intel                   2:2.2.1-1ubuntu5, then
the key could be exanocomposite true option.

I think I have no problems with compiz and exanocomposite true. I see
the cube and others. Although I not use compiz by default in my system.

I am using too: INTEL_BATCH=1 in etc/environment because this increase
3D render speed notably. (glxgears from 4000 to 5000 FPS)

-- 
Frequent crashes on i915GM (Thinkpad X41) Error in I830WaitLpRing()
https://bugs.launchpad.net/bugs/176377
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