It freezes for me too, although I have a Radeon graphics.
I don't think it happens randomly, but when I try to switch windows by clicking 
on a window button in window list of gnome-panel. The previous task remains 
pressed, the new one is pressed too, but what I think is a keyboard grab makes 
desktop unusable because only the mouse moves, the keyboard does not work 
except for Alt+SysRq keys. Could not find any errors in logs. Switching to 
other windows using Alt+Tab works without problem.

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Hardy freezes when using compiz
https://bugs.launchpad.net/bugs/175744
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