On Mon, Feb 15, 2016 at 5:18 AM, Russel Winder <russel@winder.org.uk> wrote:
I decided this morning (no idea why) to follow up on people saying "do
not use the NVIDIA driver with Rawhide, just use Nouveau". So I
uninstalled the NVIDIA driver, manually removed all the detritus the
uninstaller just leaves behind, undid the blacklisting of nouveau,
rebooted, created a new initramfs using dracut, and rebooted.

The nouveau driver loads and everything seems fine, except that GDM
doesn't do anything.

I am clearly missing something very simple, has anyone any possible
suggestions?

Not enough detail to give any specific help, but I would start with looking through the logs. Reboot to something working, even if it's console only and do something like:

# journalctl -b -1 

And look through to see if you can find a hint or smoking gun.

Thanks,
Richard