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Tuesday, 20 October 2020

Common xrandr Examples for mutliple monitors

0. Basic ideas

XRandR stands for X Window System Resize and Rotate, which is a extention to old X Window System. XRandR makes X Window System

(1) does NOT need xorg.conf any more; 
(2) supports multiple monitors dynamically without rebooting.

 1. Get the vedio output interfaces' names

$ xrandr
Screen 0: minimum 320 x 200, current 1924 x 1440, maximum 16384 x 16384
LVDS-1 connected primary 1024x768+0+0 (normal left inverted right x axis y axis) 0mm x 0mm
   1024x768      59.98*+
   960x720       60.00
   928x696       60.05
   896x672       60.01
   1024x576      59.95    59.96    59.90    59.82
   960x600       59.93    60.00
   960x540       59.96    59.99    59.63    59.82
   800x600       60.00    60.32    56.25
   840x525       60.01    59.88
   864x486       59.92    59.57
   700x525       59.98
   800x450       59.95    59.82
   640x512       60.02
   700x450       59.96    59.88
   640x480       60.00    59.94
   720x405       59.51    58.99
   684x384       59.88    59.85
   640x400       59.88    59.98
   640x360       59.86    59.83    59.84    59.32
   512x384       60.00
   512x288       60.00    59.92
   480x270       59.63    59.82
   400x300       60.32    56.34
   432x243       59.92    59.57
   320x240       60.05
   360x202       59.51    59.13
   320x180       59.84    59.32
VGA-1 connected 900x1440+1024+0 left (normal left inverted right x axis y axis) 410mm x 256mm
   1440x900      59.89*+
   1280x800      59.81
   1152x864      75.00
   1280x720      60.00
   1024x768      75.03    70.07    60.00
   832x624       74.55
   800x600       72.19    75.00    60.32    56.25
   640x480       75.00    72.81    66.67    59.94
   720x400       70.08
HDMI-1 disconnected (normal left inverted right x axis y axis)
HDMI-2 disconnected (normal left inverted right x axis y axis)
DP-1 disconnected (normal left inverted right x axis y axis)
DP-2 disconnected (normal left inverted right x axis y axis)

2 Turn off a monitor

$ xrandr --output VGA-1 --off

3 Turn on a monitor

$ xrandr --output VGA-1 --auto

4 Duplicate monitor1 to monitor 2

$ xrandr --output VGA-1 --same-as LVDS-1

5 Extend monitor1 to monitor 2

# monitor 2 is placed on the right of monitor 1
$ xrandr --output VGA-1 --right-of LVDS-1 

6 Rotate the picture on a monitor

# rotate 90 degrees to left
$ xrandr --output VGA-1 --rotate left





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