I may have the same problem with acer travelmate 4001lmi (mobile radeon 9700 / 
64mb).
I disabled compiz, but as soon as a access the screensaver applet or any other 
3d apliccation (glxinfo, glxgears...) the system freezes.

This started during 08.04 alpha (even the live / install-cd was affected). It 
was fixed in the stable version but after updating the system, it reoccurred.
Fedora9 shows the same symptoms.

https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/+bug/195721
https://bugs.launchpad.net/ubuntu/+bug/203007

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X freezes in drmCommandWrite() when Compiz is enabled on ATI Radeon Mobility 
9600
https://bugs.launchpad.net/bugs/195051
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