I'm trying out the catalyst driver 12.1 and I'm clearly missing something when trying to blacklist the radeon driver. When booting catalyst it tries to load the radeon module and and when I get as far as gdm I get either a blank screen or a screen of coloured lines then the system reboots. I tried adding the following to /etc/modprobe.d/blacklist.conf
But it still loads the radeon module. I'm clearly missing out a step, because if I edit by grub boot string to include rdblacklist=radeon
it boots ok.
Could someone tell me what I've missed?