Just a heads-up:  I filed a similar bug (at Bryce's suggestion) at
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-
ati/+bug/206845

I'm running a similar setup (ThinkPad with ATI Radeon Mobility 9000),
but I'm getting some different output in the backtrace.  I've also
discovered that the freeze with mouse activity can be reproduced on my
system by switching to the "Braid" screensaver in Gnome Screensaver
Preferences.  Nick, could you give it a try?

When I switch to Braid, everything but the mouse locks up.  Strangely,
the system will recover if I choose a different screensaver (even though
the system appears unresponsive to clicks).  This freeze will persist
anywhere from 5 minutes to an hour and then POOF, the system is again
responsive with the new screensaver selected.  I should also warn that I
get  broken pipe if I select random screensaver and Braid happens to
come up (that's how I stumbled across the problem with Braid in the
first place).

Anyway, all the backtraces I managed to collect during the "freeze"
ended with problems in Dispatch() in dix/dispatch.c and dix/main.c.  No
problems with drmCommandWrite() here.

-- 
X freezes in drmCommandWrite() when Compiz is enabled on ATI Radeon Mobility 
9600
https://bugs.launchpad.net/bugs/195051
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