I have i915G and I have the same symptoms at my compiz-fusion-powered Ubuntu 
7.10. My system completely freezes and only alt+SysRQ+K helps to solve my 
problem. I can not get what makes my GL-desktop to behave like that. Esp. 
horrible is that there are no errors in logs! At all! I notice it happens when 
I try to open menus at some window (or when I try to drag files from 
file-roller, or when I get hovered messages from open OpenOffice document, or 
when I try to drag from webpage and drop link to bookmark place in Firefox), 
thus, when I drug an object over another one and both blurred and animated.
I use:

00:02.0 VGA compatible controller: Intel Corporation 82915G/GV/910GL Integrated 
Graphics Controller (rev 04)
(i915G videocard, 32 Mb shared DDR2 of 2048 Mb, AGP aperture size - 128 Mb)
2.6.22-14-generic
direct rendering: Yes
OpenGL renderer string: Mesa DRI Intel(R) 915G 20061017 x86/MMX/SSE2
OpenGL version string: 1.3 Mesa 7.0.1
X.org: 1:7.2-5ubuntu13

I shut down Compiz - it helps me to use my machine right. No deathlike
freezes after that.

-- 
[gutsy] X crashes randomly - something with cursors? (945GM)
https://bugs.launchpad.net/bugs/153466
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