I am having the same problem.  Travelmate 4670, Intel Centrino Duo and
ATI mobility x1400

I can consistantly reproduce this by starting a session from GDM, then opening 
an xterminal and typing
glxinfo.

At that point, I can still focus on Windows, but I cannot click on
buttons, or drag or scroll.  I can still restart X w/ a ctrl-alt-
backspace.  I can also switch screens with ctrl-alt-F1, F2, etc.

The only thing that seems to work is to start up w/out Compiz.

Let me know if I can test or can provide more info to help.

-Scott


** Attachment added: "My lspci -vn"
   http://launchpadlibrarian.net/11303066/lspci.txt

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