https://bugs.freedesktop.org/show_bug.cgi?id=30025
--- Comment #2 from aaron chainsawbike@gmail.com 2010-09-05 05:05:55 PDT --- yep passing radeon.no_wb=1 to the kernel fixes it
@glxgears i kinda expected that but i don't think im using it for one... im just trying to show the difference between reported and apparent frame-rate in certain situations - it just seems odd...