Hello, I had a dual-head setup running, that consisted of my laptop screen (1680x1050) and an external monitor (1400x1050) in a "wide-screen" config (the two screens besides each other). The problem was always, that the 3D rendering engines waves of after 2560 (yes there is a corresponding bug report open). So I want to switch to a stacked setup (on screen above/below the other). Influence mainly be textured video, that magicly disappears behind the border (not to surprising). The problem: After I activate the second screen, the lower half is garbled. I can "fix" this by running glxgears and moving it over the area. After that everything is fine - moving another "2D"-Window over the garbled area does not help. I'll attach the running log, the config and screenshots. Thanks in advance Matthias
Created attachment 14926 [details] Screenshot showing the garbadge
Created attachment 14927 [details] With 1024x768 on second screen everything is all right
Created attachment 14929 [details] The corresponding xorg.conf
Created attachment 14930 [details] Xorg log of the session
Ok - I overlooked the AccelDFS Option. I could either force the system to AGP 1x or deactivate AccelDFS both work. Please excuse the noise. Matthias
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