gdm busted?

[Tom Horsley]

I thought I had video working on f22 via the binary
nvidia drivers because I could run startx after getting
them installed, but when I changed the default target
from multi-user to graphical, then booted f22, the screen
just keeps flashing between black and the text mode
boot messages, like gdm is trying to start, crashing,
then trying to start again.

I'll try kdm next (I normally switch to kdm anyway,
I just hadn't gotten that far yet).