You need to attach the output of nvidia-bug-report.sh
I don't remeber if 280.13 is compatible with xorg-server 1.12, it's not according to:
You can try to reproduce on F-15 but with the 295.53 packages from rpmfusion-nonfree-updates-testing. (You will need the kernel from fedora updates-testing for pre-built kmod).
Now the other way would be to grab the lastest nvidia packages ( xorg-x11-drv-nvidia xorg-x11-drv-nvidia-libs akmod-nvidia) from:
You will need to install kernel-devel and run akmods --force