I've just spent too long messing with a small PC to replace my Raspberry Pi Kodi machine. Problem was that the system would blank the screen after 10 minutes and there's too much stuff to test, and each test takes 10 minutes. Make a change, reboot, wait 10 minutes, make another change, and so on.
The problem was the Xorg default screen blanking, and it was fixed by creating /etc/X11/xorg.conf, with only the following config in it:
Option "IgnoreABI" "True"
Option "BlankTime" "0"
Option "StandbyTime" "0"
Option "SuspendTime" "0"
Option "OffTime" "0"
I had previously tried a bunch of stuff with setterm and enabling rc.local to run from Systemd, all to no avail, so I wanted to document this one for the next time.