Just pitching in to report that
Option "ExaNoComposite" "true"
definitely solved this problem for me (as a workaround). I usually had
2-3 daily spontaneous X crashes as described previously in this bug,
they stopped immediately when I added this option and restarted X.
What exactly does this option turn off? OpenGL still works nicely for
me (I develop opengl apps), but I don't run 3d effects in the window
manager.
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Frequent crashes on i915GM (Thinkpad X41) Error in I830WaitLpRing()
https://bugs.launchpad.net/bugs/176377
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