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The issues are sorted out more or less on my openSUSE 11.1 64-bit install. I use Catalyst 9.5, because version 9.6 seems to be a bit unstable and sometimes sluggish on my system.
I should add, however, that when I want to use desktop effects under KDE 4.x I am still hit by this issue (sluggish maximizing and resizing windows, http://www.phoronix.com/forums/showthread.php?t=15163) and bad video performance (video playing with changing speed, not well synchronized with audio. As a non-native speaker I have a question: Is this called tearing?).
There are workarounds for the slow window resizing issue (for Ubuntu: search for "no backfill PPA", on openSUSE I compiled my own set of xorg packages including the respective changes). However, the problem with the video output prevails.