Finally found some time to mess around with some of the options for the trident driver. I found what seems to be a fix for this problem: turn off all the options I might have used for Dapper, and instead use Option "AccelMethod" "exa".
#Option "CyberShadow" "True" #Option "ShadowFB" "true" #Option "NoAccel" "false" Option "AccelMethod" "exa" -- Dragging and scrolling garbles window content (edgy beta) https://launchpad.net/bugs/63051 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs