FGLRX Catalyst 10.6 has slight bug
Friday, June 18th, 2010I’m not sure how many people this bug effects, but with certain setups Catalyst 10.6 will segfault on load. This effects very few people.
The fix is to edit /etc/X11/xorg.conf and add BusID "PCI:1:0:0" inside the Section "Device" that defines your card (almost all people only have one of these)
The BusID should match the PCI ID that lspci | grep Radeon says.