Using “xrandr” command line tool to mirror a display to an external monitor

Problem statement

Found this issue when doing some training, where I had connected my laptop to two external monitors; a hp 27 inch monitor and a 55 inch sony tv. Having the training material on the Sony TV, I had to keep looking at the tv when scrolling. So after some googling found a solution where I could mirror my laptop main display to the sony tv and problem solved.

Solution

First confirm what connected display are present; xrandr | grep -w connected

Next set the display so that the external monitor will mirror the current display; xrandr --output [mirror-display] --same-as [main-display]

It works!!

Reference

How to Mirror a display to an external Monitor