brain-config/usr/share/brain-config/10-blanking.conf

Section "Extensions"
    Option      "DPMS" "Disable"
EndSection

Section "ServerLayout"
    Identifier "ServerLayout0"
    Option "StandbyTime" "0"
    Option "SuspendTime" "0"
    Option "OffTime"     "0"
    Option "BlankTime"   "0"
EndSection