using linux-image-2.6.32-24-generic-pae on thinkpad T400 intel gpu, I've 
encounter the same issue mouse cursor movement become jerky.
Cpu usage of kslow is too high:
 1046 root      15  -5     0    0    0 S   13  0.0   0:03.94 kslowd000          
                                                                                
                   
 3692 root      15  -5     0    0    0 S   12  0.0   0:01.58 kslowd002          
                                                                                
                   
 3694 root      15  -5     0    0    0 S   11  0.0   0:00.32 kslowd001

I've found the following lkml thread http://www.gossamer-
threads.com/lists/linux/kernel/1238374 discuss the same issue.

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kslow wakes up every 10 seconds making the mouse cursor
https://bugs.launchpad.net/bugs/613762
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