docs/workflows/operations/Linux/CachyOS/Restrict Monitors on Plasma Login Screen.md

Purpose

I wrote this document because CachyOS's desktop environment has this dumb issue where the login screen tries presenting itself on every monitor, and due to my unique configuration that includes an invisible display created from my soundbar, I have to run the commands below to configure the Plasma login screen to mimic my environment.

Configure the Displays

The first thing you want to do is configure the displays so they are arranged / cloned the way you want. This will be mirrored into the login screen configuration.

Copy Display Configuration into Plasma Login Screen

Run the following commands as your normal user, do not run them as root.

sudo install -d -o plasmalogin -g plasmalogin /var/lib/plasmalogin/.config
sudo cp ~/.config/kwinoutputconfig.json /var/lib/plasmalogin/.config/kwinoutputconfig.json
sudo chown plasmalogin:plasmalogin /var/lib/plasmalogin/.config/kwinoutputconfig.json

Logout and Verify

At this point, the lock screen / login screen should be correctly configured to mirror the normal desktop environment and display arrangement.