I have the same problem.
One easy way to spot this is to watch the credit roll-up at the end of movie,
you will easily notice the stuttering.
Personally I have a core i3 graphics with intel open source driver.
Here is one way to avoid this stuttering while keeping Compiz on (works
for me) :
1-
sync_to_vblank is still not activated by default in Lucid
refresh_rate must be at least @ 60Hz
The 50Hz and no vsync bydefault is a non sense and contribute to a bad user
experience with tearing.
This also affects Video playback where vsync is very important.
--
Disable detect refresh rate
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