How to Set A Custom Screen Resolution in Ubuntu Desktop

Your preferred screen resolution is not available in the Display settings?
Well, here I’m going to show you how to add a custom screen resolution in Ubuntu.

On my Ubuntu Desktop, 1360x768 (16:9) resolution is missing. So I can’t use it on my external monitor.

To add custom resolution we can use xrandr to create new custom resolution profile.

1. Open terminal via Ctrl+Alt+T or by searching for “Terminal” from dash. When it opens, run command:
   xrandr
It outputs current screen resolution as well as all available solutions. ALL I need here is the display device name, in my case, it’s DP-1.
2. Run command to calculate VESA CVT mode lines by given resolution:
   cvt 1360 768
Replace 1360 768 in the command to your desired screen resolution
3. Copy the Modeline, and run command to add new mode:
   sudo xrandr --newmode "1360x768_60.00" 84.75 1360 1432 1568 1776 768 771 781 798 -hsync +vsync
The command section after --newmode are COPIED from previous step output.
   For Ubuntu 17.10 Wayland, run xhost si:localuser:root command first in the terminal window to avoid sudo failure “No protocol specified Can’t open display 0:”
4. Now add the new created mode for your display device:
   sudo xrandr --addmode DP-1 "1360x768_60.00"…