Some more testing, this time with 'extremetuxracer' (3D game from Ubuntu
sources).

This game works fine on my desktop machine (Radeon 9600 XT) with the open radon 
driver.
On the Thinkpad the game appears to freezes after 2-5 seconds. The music 
continues, though.

The backtrace is similar to the last one from the 3D screensaver (attached).
I tried to kill the game remotely which only worked via 'kill -9'
The screen stays the same but the music stops, so obviously it's not the game 
that froze in the first place but X.

Then I tried to restart X via:
$ sudo /etc/init.d/gdm restart 
 * Stopping GNOME Display Manager...                                     [ OK ] 
 * Starting GNOME Display Manager...                                     [ OK ] 

Although it looks good in the remote shell, the screen stays the same and 
there's nothing I can do.
Finally 'sudo shutdown -h now' did work.

** Attachment added: "backtrace-etracer"
   http://launchpadlibrarian.net/12895009/backtrace-etracer

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