Gero, i965 graphics card and screen messed up (rather than just frozen)
suggests bug 120834, not this bug.  I have edited the description to
make the difference clearer.

DRI is on by default; to turn it off (which avoids both these bugs, but may 
drastically reduce performance) add
         Option "DRI" "false"
to the graphics controller Device section of /etc/X11/xorg.conf.

Note also that X starts a new log file on every reboot, so for crash
bugs the log file you need is Xorg.0.log.old, not Xorg.0.log.  (This bug
doesn't log anything, but 120834 logs Error in I830WaitLpRing(), timeout
for 2 seconds)

-- 
opengl total freeze using DRI with intel 945 graphics chip
https://bugs.launchpad.net/bugs/177518
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