Disable second, non-existent screen from command line
You can use the following command:
xrandr --auto
If this doesn't disable your non-existent VGA, then use the following method:
-
First run:
xrandr --currentto get the right name of your VGA. This can be
VGA,VGA-0,VGA1,VGA2and others. -
If the name of your VGA is, for example
VGA2(as you said), then run:xrandr --auto && xrandr --output VGA2 --offThis should disable the output of
VGA2.
See man xrandr for more info.
Then, if you get it to work, put the right command in a small script, make it executable and put it to run on start up.