De um wiki em arco Use o Xend backend
The Wayland backend is used by default and the Xorg backend is used only if the Wayland backend cannot be started. As the Wayland backend has been reported to cause problems for some users, use of the Xorg backend may be necessary.
Para usar o backend do Xorg por padrão, edite o
/etc/gdm/custom.conf file and uncomment the following line:
#WaylandEnable=false
Espero que seja atual.