CS2: Incorrect scaling when external monitor with different scale is used as primary display (Wayland / Plasma)

[frmdstryr]

Your system information

• System information from steam

system info runtime info

• Have you checked for system updates?: [Yes/No] Yes

Please describe your issue in as much detail as possible:

I am on KDE Neon & Plasma Wayland (Ubuntu 22.04). My laptop is a 16:10 display and I have an external 16:9 monitor connected to my laptop that I use as the primary display (see configuration in screenshots below).

When my laptop display is set to use 125% scaling and the external monitor is set at 100% scaling, CS2 opens on the correct display (external monitor) but uses the incorrect scaling and does not fill the whole screen. As shown below

Also mouse positions seem to be incorrectly mapped so the buttons / mouse positions don't match what is shown on the screen.

If I change the builtin laptop display to 100% scale or change the external to 125% scale (so they both match) then open CS2 it works correctly.

Steps for reproducing this issue:

1. Attach separate monitor and mark as primary display in system display settings
2. Set built in screen to 125% scaling and external to 100% scaling as shown in attached screenshots below
3. Open CS2

Let me know if anything else is needed to clarify. Thanks.