Weirdness - on the PC using the built-in drivers for the 9600 it showed the resolution correctly. After installing the latest ATI drivers it now shows 1360x768. So far I haven't found a function to only show the current resolution non-scaled.

Had to reload the PC - apparently Ubuntu does not like being cloned to a different type of drive (80GB ATA to 250GB SATA). GRUB wouldn't show the boot menu....