Given you have a GM945 and Xorg.0.log contains the lines 
(EE) intel(0): Failed to set tiling on front buffer: rejected by kernel
(EE) intel(0): Failed to set tiling on back buffer: rejected by kernel
(EE) intel(0): Failed to set tiling on depth buffer: rejected by kernel

you are most likely seeing the "a17 swizzling" bug.

Could you please install the package xserver-xorg-video-intel-dbg, then run the 
command:
sudo intel_reg_dumper | grep interleaved

and paste the result here?

-- 
[i945] 1 fps in 3d apps like neverball with EXA (UXA fixes all but GoogleEarth)
https://bugs.launchpad.net/bugs/357290
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