Hello, I think I've stumbled over a composition bug (doesn't happen with ExaNoComposite) which is also present in the Intel-Driver: https://bugs.freedesktop.org/show_bug.cgi?id=16913 However the latest nouveau release I tested against was 0.10 (that one shipped with Fedora9), and I don't have a spare system arround that I could use for testing. It would be really great if somebody running a more recent release could try the source attached to the intel-bug-report, compile it using: gcc -lX11 -lXrender scale_clip_artifact2.c -o scale_clip_artifact and just run it. Thank you in advance and thanks for working on this really excellent driver, Clemens