Confirming the same happening on Thinkpad T42 (ATI Radeon 7500). Desktop
locks up, usually with just mouse cursor moving (and some visual
artifacts on top of the screen). I noticed however, that usually it is
possible to put the keyboard in raw mode (Alt-SysRq-R) and then switch
to a text console ( eg. Alt-Ctrl-F1). From here it is at least possible
to restart X (btw - any chance of restarting window manager / X etc.
without killing open applications?...) The output of top shows
compiz.real consuming ~100% CPU time...

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X freezes when compiz is enabled on ATI cards
https://bugs.launchpad.net/bugs/108527
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