In ubuntu to turn off and on monitor using command:
xrandr --output DP1 --off
To turn it on again, left of HDMI monitor you can use:
xrandr --output DP1 --left-of HDMI1 --auto
To list monitors, to see their names ie HDM1, DP1 etc:
 xrandr -q
In ubuntu to turn off and on monitor using command:
xrandr --output DP1 --off
To turn it on again, left of HDMI monitor you can use:
xrandr --output DP1 --left-of HDMI1 --auto
To list monitors, to see their names ie HDM1, DP1 etc:
 xrandr -q