Hi Marco,
I might have a similar issue. Can you please look in the /var/log/kernel* and 
/var/log/syslog* logs and tell if there are any garbled (non-readable) entries 
at the time of the crashes.
 I reported this #489447 bug. My video chip is ATI X200 (rc410) though. Things 
got worse with the kernels >*31-14* 
Thanks

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System completely freezes with Visual Effects (normal) is turned on
https://bugs.launchpad.net/bugs/491588
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