I’m on OpenSUSE with KDE Plasma and have HDR working with no problems in native application and Vulkan games, however when playing Windows games through Proton, the only way I can get it to work is through gamescope.
Launching gamescope for each game works but, from what I’m understanding, Steam expects an x11 window for the overlay to work, so it won’t open and this also breaks controller remapping through Steam input (which I often need).
My current solution is to open a new tty session and run Steam inside gamescope (which is similar to how it works on SteamOS) there. Is there a cleaner solution now, as what I’m doing now can a bit janky with some things?
Use Proton-GE! It has fixes to make the overlay work under Wayland.
I have been playing in HDR with a Steam Controller (which needs the overlay) for a while and it works perfectly.
This. You can use something like ProtonPlus (available as a flatpak/on Discover) to install/update ProtonGE if you’re feeling lazy, and can set the default compatibility layer in steam settings so you don’t have to adjust it for every game
Also, fellow OpenSUSE+KDE user here :)