Hello,
just tried 2.6.18-rc4-mm1 without any patch and every movies played with xine play really too fast (mplayer is fine).
With http://marc.theaimsgroup.com/?l=linux-kernel&m=115547315918564&w=2 and the one from Frederik Deweerdt about kernel/posix-cpu-timers.c but thats don't solve my issue...