I have tried an upstream kernel now:
Linux till 2.6.35-020635rc6-generic #020635rc6 SMP Fri Jul 23 10:08:28 UTC 2010 x86_64 GNU/Linux
This kernel works. The mouse is always smoothly running and there are no kslowd processes in "top". So it must be an Ubuntu patch issue.
I have tried an upstream kernel now:
Linux till 2.6.35- 020635rc6- generic #020635rc6 SMP Fri Jul 23 10:08:28 UTC 2010 x86_64 GNU/Linux
This kernel works. The mouse is always smoothly running and there are no kslowd processes in "top". So it must be an Ubuntu patch issue.