I commented on the upstream bug, and will do so here.  I showed this bug
to Alex Deucher; he hadn't seen this particular bug but has an idea what
the underlying cause is.  When -ati was developed they did not have
access to the Radeon register documentation so made a lot of guesses,
that have been proven wrong since then as the Radeon documentation has
become available.  As a result, he believes a lot of registers have been
incorrectly mapped in -ati, causing random failures such as have been
described.  He plans to get these mappings corrected within the next 3-6
months.  So there's no chance this will be fixed for Hardy, but
hopefully will be in place for Intrepid.

I don't know how hard the register mapping work is, but suspect it's
pretty straightforward grunt coding work.  If anyone is anxious to see
these issues fixed and interested in putting some time into it, please
contact me or Alex (aka agd5f on #xorg-devel/Freenode) for details.

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