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I keep my Laptop PC always connected to my HDMI tv. When I am watching a movie on the tv, i use the command xrandr --output LVDS1 --off to turn my laptop screen Off (it is annoying to see the movie on a small screen beside the Tv).
So, with this command, the Laptop Screen is Off, and everything is displayed in the TV
The question is: How do i Turn my Laptop Screen BACK ON? Right now, i have to remove the HDMI cable, then it turns on. I Would like to do it via Command Line. How?????
xrandr --output LVDS1 --auto
did it
When accidentally disabling the only attached display, trying to reenable it from another virtual console will yield in the following error message:
xrandr: Configure crtc 0 failed
Please make sure the actual virtual console where X Windows is running is active, when xrandr is actuating the configuration. Typing the following in the first virtual console rescued me:
sudo chvt 7; sleep 3; xrandr --display :0.0 --auto
xrandr --output LVDS-1 --right-of HDMI-1 --auto
enables LVDS-1, putting it logically beyond right side of HDMI-1. The other two answers here copies the current display in both screens.
