Setting custom screen resolution (1920x1080) on KDE Plasma/Debian 11

KDE_custom_screen_resolution.txt

First of all, enter "xrandr" in the terminal to list all available screen resolutions:

	$ xrandr 

Note the name of the output that corresponds to your monitor, For example,
VGA-1 or Virtual1 (For Virtual Box).

Then enter this:

	ro@debian-main:~$ cvt 1920 1080
	# 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

Take the output from that and put in the terminal:


	ro@debian-main:~$ xrandr --newmode "1920x1080_60.00"  173.00  1920 2048 2248 2576  1080 1083 1088 1120 -hsync +vsync

Then enter these commands:

	ro@debian-main:~$ xrandr --addmode Virtual1 1920x1080_60.00
	ro@debian-main:~$ xrandr -s 1920x1080 -r 60

Screen resolution will change.

Enter xrandr in the terminal to see available screen resolutions.

	ro@debian-main:~$ xrandr

And you will see your screen resolution there.

P.S. If your screen resolution returns to the same resolution try to turn off the background service "KScreen 2" in the 
Settings -> Startup and Shutdown -> Background Services.