For me it does not simply happen with compiz. It is happening on
metacity, too. It happens every time after playing a video using xv-
output, at least while dri is loaded (I did not test to disable dri). I
don't need to have heavy 3d activity for this to occur.

Blacklisting the chips, though I am not a fan of compiz (I simply do not
use it because I want to work with my machine, the only tool that compiz
has and I miss in metacity is the scale-plugin), would result in many
compaints of users who will say it used to work, but now it doesn't. Why
not switching to i810? At least for me this does not mean any regression
in comparsion to intel, the only difference (beside of the crash with
intel) is, that for i810 I have to adjust contrast-settings for xv while
using intel, I have to adjust saturation, too (intel XV seems not to
like my hp nx6110 :-)).

-- 
laptop hangs when switching video mode
https://bugs.launchpad.net/bugs/127101
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