Since upgrading to udev, i'm having simuliar issues. It seems that the nvidia_agp module isn't being loaded. Manually loading this module fixed the problem with xorg not starting.. or display a black screen.
I've attached a log of what xorg said in it's log when the module wasn't loaded ii udev 0.071-1 /dev/ and hotplug management daemon ii linux-image-2.6.12-1-k7 2.6.12-10 Linux kernel 2.6.12 image on AMD K7 machines error from xorg fglrx(0): [agp] unable to acquire AGP, error "xf86_ENOMEM" -- Anthony Tippett
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