I have the same problem here with Radeon 9550. I fixed it by booting with Live CD, chroot to my root partition and aticonfig -f --initial --overlay-type=Xv.
The annoying thing is that sometimes KDE loses its screen resolution settings, jumps to highest possible (i.e. unusable) resolution and when I change back in System Settings, a broken xorg.conf is generated again.
I attach kdm.log, the broken xorg.conf and working xorg.conf.
I have the same problem here with Radeon 9550. I fixed it by booting with Live CD, chroot to my root partition and aticonfig -f --initial --overlay-type=Xv.
The annoying thing is that sometimes KDE loses its screen resolution settings, jumps to highest possible (i.e. unusable) resolution and when I change back in System Settings, a broken xorg.conf is generated again.
I attach kdm.log, the broken xorg.conf and working xorg.conf.