Section "Device" Identifier "ATI Technologies, Inc. Radeon Mobility 9000 (M7 LW)" Driver "radeon" BusID "PCI:1:0:0" Option "DynamicClocks" "on" Option "AGPMode" "8" Option "AGPFastWrite" "on"Option "EnablePageFlip" "on" VideoRam 65536EndSectionYou might want to comment out AGPFastWrite and EnablePageFlip for now.
Turning off AGPFastWrite did the trick; EnablePageFlip can remain switched on.
Thanks a lot, Kai.