Looks like you dont have xinit running?
root@Miner-2:~# ps aux | grep X11
jason 1426 0.0 0.0 4396 656 ? Ss 18:04 0:00 /bin/sh /etc/xdg/xfce4/xinitrc -- /etc/X11/xinit/xserverrc
root 2179 0.0 0.0 13600 928 pts/2 S+ 18:04 0:00 grep --color=auto X11
I do though....
Oizopower respons (stuck in newbie jail):
Try "DISPLAY=:0.0 aticonfig --adapter=all --odgt" without the ""
or maybe add sudo if you are not root.