1. $ xrandr
  2. Screen 0: minimum 3840 x 1200, current 3840 x 1200, maximum 3840 x 1200
  3. default connected 3840x1200+0+0 0mm x 0mm
  4. 3840x1200 50.0*
  5. $ xrandr --output "Screen 0" --left-of default
  6. warning: output Screen 0 not found; ignoring