I have an Nvidia card and use the proprietary driver, so I've blocked
updates to X for the time being until RPMfusion gets the new kmod
module for Nvidia version 352.63. In any case, my current X server
is xorg-x11-server-Xorg-1.17.4-1.fc22.x86_64.
Rebooting with kernel-4.2.6-301.fc23.x86_64 works.
poc