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Changing Display Configuration using xrandr

1.To list available displays
xrandr -q
Sample output
Screen 0: minimum 320 x 200, current 2560 x 1080, maximum 16384 x 16384
eDP connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 309mm x 173mm
   1920x1080     60.01*+
   1680x1050     60.01  
   1280x1024     60.01  
   1440x900      60.01  
   1280x800      60.01  
   1280x720      60.01  
   1024x768      60.01  
   800x600       60.01  
   640x480       60.01  
HDMI-A-0 connected 640x480+1920+0 (normal left inverted right x axis y axis) 0mm x 0mm
   640x480       59.94*
   1920x1080     60.01  
   1680x1050     60.01  
DisplayPort-0 disconnected (normal left inverted right x axis y axis)
2.Add new resolution mode to display X.
xrandr --addmode X 1280x1024
3.Use newly added mode.
xrandr --auto --output X --mode 1280x1024
Find mode Configuration
1.Using gtf
gtf 1920 1080 60
Sample output
  # 1920x1080 @ 60.00 Hz (GTF) hsync: 67.08 kHz; pclk: 172.80 MHz
  Modeline "1920x1080_60.00"  172.80  1920 2040 2248 2576  1080 1081 1084 1118  -HSync +Vsync
2.Using cvt
cvt 800 600
Sample output
# 800x600 59.86 Hz (CVT 0.48M3) hsync: 37.35 kHz; pclk: 38.25 MHz
Modeline "800x600_60.00"   38.25  800 832 912 1024  600 603 607 624 -hsync +vsync

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