"The latest Nouveau upstream code is currently in Fedora
Rawhide, but the Gallium3D driver at this time won't be enabled
since it's not yet in a usable state. The Nouveau driver is
replacing the xf86-video-nv DDX driver, but this official
open-source NVIDIA driver will remain installed and will be used as
a fall-back if Nouveau doesn't recognize a chip or runs into other
problems."