disabling dri in xorg.conf seems to do the trick for me. dont know if it is a real fix or just intermittent.
got the idea from https://bugs.freedesktop.org/show_bug.cgi?id=6933 -- Xv movies on 810/i945 gives horrible color, Gamma https://launchpad.net/bugs/32963 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
