[Edit] Ah yes, the first line in /var/log/boot.log is this, which has been reported by others on fedoraforum as well:
FATAL: Error inserting fglrx (/lib/modules/2.6.27.5-117.fc10.i686/fglrx.ko): Operation not permitted
Last edited by Christian_L; 11-25-2008 at 12:49 AM.
The bad kernel module was the radeon driver being loaded. I initially tried
a) Adding "blacklist radeon" to /etc/modprobe.d/ati
b) uninstalling the xorg*ati*rpm package
c) removing the "rhgb" and adding "nomodeset" options to /boot/grub/menu.lst to stop the graphical boot
However the radeon module was still loaded
I then (after the above) rebuilt initrd , and after a reboot - no ati module!
I then installed the fglrx drivers (I tried both the feed on rpmfusion, as well as an install from the official driver, but in neither case could I get sensible behaviour
Note that interestingly I had no issues with changing xorg to run "radeonhd" instead of "radeon" -- not that radeonhd was any better, indeed I think ati works the best.
Overally the opensource ati is working fairly well for desktop. 3D comes and goes dependent on the kernel/ati updates from the update feeds. more on that here -> http://forums.fedoraforum.org/showthread.php?t=204296