https://bugs.freedesktop.org/show_bug.cgi?id=34427
--- Comment #3 from Harald Judt h.judt@gmx.at 2011-02-21 01:43:42 PST --- No, Option "ColorTiling" is not in xorg.conf. I've added it now, but setting it to true or false makes no difference at all.
Option "AccelMethod" "EXA" Option "EnablePageFlip" "on" Option "ColorTiling" "true" Option "ClockGating" "1" Option "DynamicPM" "on"
I'd say it can't be page flipping either because the problems started quite some time before it was introduced.