I've got a similar problem with my almost identical ThinkPad T42 / Mobility 
Radeon 9600 chip.
Well, with the latest version of the fglrx driver compiz runs perfectly well 
and the machine is also able to suspend properly. But however, when I try to 
resume - with compiz previously enabled - I a get a grey and somewhat speckled 
slim bar on the lower right of the screen with some artifacts around the mouse 
cursor. The mouse can be moved but nothing else will work - compiz desktop will 
just not awake a second time!
When I previously disable compiz and then set my machine in suspend mode, this 
grey bar shows up as well, but only for a couple of milliseconds and then the 
desktop appears to start normally.
There is another problem, I don't know if it is related to this one: when I 
log-off and try to lag back on (with compiz enabled) X freezes totally and the 
only thing I can do is a hard reboot! This happens every time I try to start X 
for a second time.
I can provide you with more information - configuration files and logs - just 
say what you need and where I can find it!

** Attachment added: "Xorg.0.log"
   http://launchpadlibrarian.net/12433344/Xorg.0.log

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X freezes when Compiz is enabled on ATI Radeon Mobility
https://bugs.launchpad.net/bugs/195051
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