Could you post your /val/log/Xorg.0.log (as an attachment, not inline)?
I assume you use radeonhd. I vaguely remember having issues with the
radeonhd driver. Try to use ati, perhaps this helps??

To use ati, enter "sudo gedit /etc/X11/xorg.conf" and change the line
containing "radeon" to "ati". Take care that no fglrx package is
installed at this time (it won't work then, at least it didn't 1-2 weeks
ago). Reboot afterwards. If it does not help, I suggest to revert this
change again so that you have a standard system again.

If X should not start any more, just undo any changes you did in the
console and reboot again.

-- 
Screen freezes using desktop effects - except mouse
https://bugs.launchpad.net/bugs/350766
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