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