export DISPLAY=:0.0 xset s off xset s noblank xset -dpms
Section "ServerFlags"
Option "BlankTime" "0"
Option "StandbyTime" "0"
Option "OffTime" "0"
Option "SuspendTime" "0"
EndSection
Section "Monitor"
Option "DPMS" "false"
EndSection
Source: https://superuser.com/questions/644804/disable-screensaver-screen-blank-via-command-line