I've asked Dave Airlie, of ATI driver fame, to take a look into this. If he doesn't have any luck, we need to escalate this to X.org and Cairo. I'm sure both would want to see this squashed!
Mark -- Cairo and ATI RENDER extension cause scrambled buttons in UbuntuLooks https://launchpad.net/bugs/34435 -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs