View the monitor output status under Linux and modify the monitor operating mode (copy or expand)

Turn off the monitor VGA1
Xrandr--output VGA1--off

Turn on the monitor VGA1
Xrandr--output VGA1--auto

Turn off the monitor LVDS1
Xrandr--output LVDS1--off

Turn on the monitor LVDS1
Xrandr--output LVDS1--auto

Open VGA1 and Close LVDS1
Xrandr--output VGA1--auto--output LVDS1--off

Turn off VGA1 and open LVDS1
Xrandr--output VGA1--off--output LVDS1--auto

When extending the mode, the LVDS1 is displayed to the left of VGA1
Xrandr--output LVDS1--left-of VGA1--auto

When you extend the mode, the LVDS1 is displayed to the right of LVDS1.
Xrandr--output LVDS1--right-of VGA1--auto

Changes from extended mode to copy mode.

Xrandr--output LVDS1--same-as VGA1--auto

Set the primary display.
Xrandr--output HDMI1--auto--primary

View the monitor output status under Linux and modify the monitor operating mode (copy or expand)