#!/bin/bash

export DISPLAY=:0.0



if [ $# -eq 0 ]; then

  echo usage: $(basename $0) "on|off|status"

  exit 1

fi



if [ $1 = "off" ]; then

  echo -en "Turning monitor off..."

  xset dpms force off

  echo -en "done.

Check:"

  xset -q|grep "Monitor is"

elif [ $1 = "on" ]; then

  echo -en "Turning monitor on..."

  xset dpms force on

  echo -en "done.

Check:"

  xset -q|grep "Monitor is"

elif [ $1 = "status" ]; then

  xset -q|sed -ne 's/^[ ]*Monitor is //p'

else

  echo usage: $(basename $0) "on|off|status"

fi

Save this script in something like /usr/bin, give it a name (like switch_dpms) and make it executable with chmod 664 /usr/bin/switch_dpm.

Now all you need to do is add it to a cron job. So open your crontab file with:

crontab -e

and add this at the bottom:

@reboot /usr/bin/switch_dpms off

Every reboot it will turn dpms to off and you can also turn it on from commandline by doing /usr/bin/switch_dpms on or check its status with /usr/bin/switch_dpms status.

Source for the script