(In reply to comment #24) > Any idea regarding the reason for this behavior? > > P.S. I noted that glxgears renders OK on fullscreen with fglrx->radeon. In > window it's wrong. Unfortunately, I didn't see anything obvious in the dump. Can you try my drm-next branch? http://cgit.freedesktop.org/~agd5f/linux/log/?h=drm-next-3.10 Does that help?