By the way, I was able to solve this problem by change the mouse polling time as described here http://www.urbanterror.info/forums/topic/21844-howto-changing-mouse-polling-rate-on-ubuntu/ on Oneiric/Precise, but on Quantal this lead to the USB driver not being loaded at startup at all, so the mouse refused to work and I had to remove the fix again...
By the way, I was able to solve this problem by change the mouse polling time as described here http:// www.urbanterror .info/forums/ topic/21844- howto-changing- mouse-polling- rate-on- ubuntu/ on Oneiric/Precise, but on Quantal this lead to the USB driver not being loaded at startup at all, so the mouse refused to work and I had to remove the fix again...