On all Arch XFCE installs I get the "Input Not Supported". debian ubuntu all work. Arch Gnomes all work.
xorg.conf file perhaps. google reference xorg files but can't boot to change it. Not sure that's the cure anyway. "nomodeset" gave me a none input display. Apparently, xorg display is mapping way beyond my monitor ability. HDMI input. Changed to VGA it just said "No Input".
Acer computer. Intel graphics.