ah, seemingly yes it is but I log in as a standard user.
[antikythera@aures ~]$ ps aux | grep [X]org
root 679 0.0 0.0 216944 4740 ? Ss 09:36 0:00 /usr/bin/abrt-watch-log -F Backtrace /var/log/Xorg.0.log -- /usr/bin/abrt-dump-xorg -xD
I'll look at root-less xorg for my notebook as it looks like a good idea. I don't want to risk breaking the proprietary AMD driver on this CentOS system though. Thanks for the link and info.
I'll try in VM first as I don't know if lightdm will respond correctly. The Arch wiki only refers to GDM