Portal 2 acts like the native resolution is the span of all three monitors while it isn't

[k1yrix]

I have a triple monitor setup all with 1920x1080 resolution. For some reason, Portal 2 thinks that the native resolution is the span of all three monitors at once (5760x1080), which is incorrect considering they are not configured to be as one monitor. (in order words, they are separated from each other)

It might be related to issue #222 or Source-1-Games issue 1797, but I'm not too sure about it.

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Setup:
OS: Linux (Kernel 6.10.11-200) - Fedora 40
DE: KDE Plasma 6.1.5
GP: Wayland
CPU: Intel i7-6600
GPU: 1x GTX 960
Monitors: 3x 1080p (or see images above)

[k1yrix]

Because of this, attempting to set the game into full screen will result in the window being compressed to the native resolution. Setting the game into the actual native resolution while in full screen will result in a fraction of the game being displayed.

The temporary solution would be just run as a window (either through settings or invoking the -windowed launch option) and then set the appropriate resolution

[Mechinsam]

has a proper fix been found yet