Catalyst 12.6 legacy beta strange artifacts

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https://bbs.archlinux.org – As described on Arch Wiki I've installed the catalyst-hd234k driver version 12.6 for my HD4200 card. This is a fresh netinstall, and I'm trying to get used to the tiling window manager Awesome. Previously using xfce (but possibly not 12.6 version of the driver) I didn't had these kind of problems. Now, almost every application creates strange artifacts on resizing and moving. Google lookup gave me nothing when generally searching for these kind of effects with 12.6 - and forgive me if I'm doing it wrong but introducing "awesome" and "awesome wm" to googl (HowTos)