https://bugs.freedesktop.org/show_bug.cgi?id=33348
--- Comment #21 from Robin Wheeler robin-linux@hotmail.co.uk 2011-06-17 08:26:50 PDT --- I'm on ubuntu 11.04 now and unity is unusable. If I boot straight to it but on my dual boot system if I boot windows xp then simply restart the laptop unity works just fine except with "tearing" in web browser. So Yes you may be right some setup state is missing in the driver. But that still will not I believe fix the "tearing".