https://bugs.freedesktop.org/show_bug.cgi?id=41766
--- Comment #1 from Pasi Kärkkäinen pasik@iki.fi 2011-10-13 15:17:52 PDT ---
Oh, I forgot to mention that changing the radeon "power_profile" fixes the problem, ie doing:
echo low > /sys/class/drm/card0/device/power_profile
fixes the problem, and there's no flickering anymore!