Links

Changing Display Configuration using xrandr

  1. 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. 2.
    Add new resolution mode to display X.
    xrandr --addmode X 1280x1024
  3. 3.
    Use newly added mode.
    xrandr --auto --output X --mode 1280x1024

Find mode Configuration

  1. 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. 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