Workaround for Nvidia with f23
Kind of of an incomplete explanation…
Really need to downgrade the xorg package to 1.17
Easiest way is to run
# dnf --releasever=22 downgrade xorg-x11-server-Xorg --allowerasing
Then add an exclude line in your dnf.conf for xorg-x11*
In /etc/dnf/dnf.conf add the following.
exclude=xorg-x11*
Downgrading X.org is the way to go for now, at least for me. I first tried adding the option ignoreABI to ServerFlags and X was able to launch again, but crashed frequently