I was under the impression that the Steam Deck runs under KDE Wayland?
I wasn't aware of it having video game support challenges due to Wayland.
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SteamOS recently shipped KDE with Wayland by default (for desktop mode).
They have their own custom compositor for handheld-mode, named gamescope. https://github.com/ValveSoftware/gamescope?tab=readme-ov-fil... XWayland based.