add a new mode resolution to external monitor in Ubuntu linux




If you need to add a new mode like 1980x1080 follow me:


1- To know the modeline of the resolution: 
$ cvt 1980 1080

you get two lines:
# 1920x1080 59.96 Hz (CVT 2.07M9) hsync: 67.16 kHz; pclk: 173.00 MHz
Modeline "1920x1080_60.00"  173.00  1920 2048 2248 2576  1080 1083 1088 1120 -hsync +vsync

 
2- copy the information after the word Modeline into the xrandr command:
the xrandr command is:  xrandr --newmode <ModeLine>
the new the xrandr command with the modeline is:
$ xrandr --newmode "1920x1080_60.00"  173.00  1920 2048 2248 2576  1080 1083 1088 1120 -hsync +vsync

3- know the name of the display:
 Just write: $ xrandr
For me the second or the external monitor is named: DP-1

4- the last line is to add the new mode to the external resolution list, so write:
$ xrandr --addmode DP-1 1920x1080_60.00


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