glxinfo's output may also be useful (specifically if you ware using 
dri/dri2(kms) or not).
You can disable KMS by adding "i915.modeset=0" to your kernel line, if that 
fixes the bug then the error is with xorg

-- 
ubuntu freezes too often
https://bugs.launchpad.net/bugs/509632
You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to xorg in ubuntu.

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