Sadly I must say, that this patch changes the behave in no way, too. :( ... It's still flickering and showing theses glitches as in the video. Could I add any debug output, any printks which would help to identify the problem? Anything else I should test? Currently I'm testing on raring latest with following kernel + the two patches mentioned in this thread. Kernel: http://kernel.ubuntu.com/git?p=ubuntu/ubuntu-raring.git;a=commit;h=82983bbf61f02dec860e266217f002c18a06006e Greetings Thilo