I'm only running FC6 as a vmware guest. However, you can try adding this to your xorg.conf to see if it helps. Section "Extensions" Option "Composite" "disable" EndSection
in FC6 (xorg7) they changed the default to enable the composite extension. because they include compiz as window manager and they don't want people to complain about stuff not working (i guess). however the current ATI drivers (8.29.6) do not support composite rendering at all, and even worse, if enable, DRI is disabled. i have the same problem and the additional entry in xorg.conf worked for me. but: no composite - no nice desktop effects :-( regards, toby