Laptop screen: eDP-1, 2880x1800@200% External monitor: DP-1, 2560x1440@100% STEPS TO REPRODUCE 1. Connect an external monitor to a laptop 2. In "Display configuration", disable the internal screen 3. Turn off and on the external monitor OBSERVED RESULT The internal screen is enabled again at (0, 0). Screen content overlaps on top of the external screen area. EXPECTED RESULT The internal screen should not be enabled. SOFTWARE/OS VERSIONS Operating System: Arch Linux KDE Plasma Version: 5.25.90 KDE Frameworks Version: 5.98.0 Qt Version: 5.15.6 Kernel Version: 5.19.9-zen1-1-zen (64-bit) Graphics Platform: Wayland Processors: 16 × AMD Ryzen 7 PRO 6860Z with Radeon Graphics Memory: 30.1 GiB of RAM Graphics Processor: AMD YELLOW_CARP
In fact, it seems I don't even need to toggle the external monitor. In "System Settings" - "Display Configuration", uncheck "Enabled" for the Built-in Screen, apply, switch to another settings page and switch back. The Built-in Screen is enabled again.
*** This bug has been marked as a duplicate of bug 459253 ***