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Use xrandr for multiple screen display
Gnome 3 does not have good support for multiple screen display. It is therefore necessary to use xrandr for such purpose. It can be used as follows.
Display the configurations:
$ xrandrScreen 0: minimum 8 x 8, current 1680 x 1050, maximum 16384 x 16384VGA-0 disconnected (normal left inverted right x axis y axis)LVDS-0 connected (normal left inverted right x axis y axis) 1920x1080 60.0 + 50.0DP-0 disconnected (normal left inverted right x axis y axis)DP-1 disconnected (normal left inverted right x axis y axis)DP-2 connected 1680x1050+0+0 (normal left inverted right x axis y axis) 474mm x 296mm 1680x1050 60.0*+ 60.0 1600x1000 60.0 1440x900 75.0 59.9 1280x1024 75.0 72.0 60.0 1152x864 75.0 1024x768 75.0 70.1 60.0 800x600 75.0 72.2 60.3 640x480 75.0 72.8 59.9DP-3 disconnected (normal left inverted right x axis y axis)DP-4 disconnected (normal left inverted right x axis y axis)DP-5 disconnected (normal left inverted right x axis y axis)
Disconnect a display:
$ xrandr --output LVDS-0 --off # This is the LCD of the laptop
Set mode of the external display:
$ xrand --output DP-2 --mode 1680x1050 # This is the external monitor in office$ xrand --output DP-2 --auto # Or use automatic detectionAfter configuration, FVWM should be restarted. Or if needed, X server should be restarted.
[13／6／20] At present, Gnome environment is used instead of FVWM or Sawfish. And three scripts have been created to change the monitor settings.
1. Only use the external monitor: extdisp.sh
#!/bin/bashxrandr --output DP-2 --mode 1680x1050 --primary --output LVDS-0 --off
2. Use two monitors, the external monitor as the primary monitor: dbldisp.sh
#!/bin/bash xrandr --output DP-2 --mode 1680x1050 --primary --right-of LVDS-0 --output LVDS-0 --auto
3. Use only laptop monitor: lapdisp.sh
#!/bin/bash xrandr --output DP-2 --off --output LVDS-0 --auto
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