I own HD 5770 card, and run latest catalyst drivers, 10.8 (ati control center reports 10.7 but i do have tesselation in unigine demo etc.) - and debian squeeze as OS.
Now that firefox 4.0b5 came out it appears that Xrender is not accellerated.
http://demos.hacks.mozilla.org/openweb/HWACCEL/ - i get 5fps here, for comparison my wife gets 60fps using nvidia binary.
Under windows i get 90fps, yet i cant seem to find any way to break the 5fps barrier under linux with or without compiz.
Is there anything that can be done? Should i enable something specific in my xorg.conf ?