Set custom screen resolution on Manjaro (Arch Linux based) distro
1. First install xorg-xrandr package if xrandr does not work
2. Create 10-dellmonitor.conf file under /etc/X11/xorg.conf.d directory
3. Enter the following lines in that file and saveSection “Monitor”
Identifier “VGA1”
Modeline “Dell” 173.00 1920 2048 2248 2576 1080 1083 1088 1120 -hsync +vsync
Option “PreferredMode” “Dell”
EndSection
4. Reboot the computer