MrCooper suggested on IRC that it might be ColorTiling related. I have therefore added the following Device Section to my xorg.conf:
Section "Device" Identifier "Mobility Radeon 9600 M10" Driver "radeon" Option "ColorTiling" "off" EndSection and will report back whether this makes the issue vanish. Greetings Marc -- ----------------------------------------------------------------------------- Marc Haber | "I don't trust Computers. They | Mailadresse im Header Mannheim, Germany | lose things." Winona Ryder | Fon: *49 621 72739834 Nordisch by Nature | How to make an American Quilt | Fax: *49 3221 2323190 -- To UNSUBSCRIBE, email to debian-x-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org