

yeah, you can’t use Protonup-Qt. you need specifically the Proton provided in the App Store as a Steam flatpak Addon. (it’s the only one that works with gamescope currently)
e.g. in GNOME and KDE’s App Stores, if you go to the Steam page, you can download Proton-GE as flatpak Addon there.




for HDR you could also try this instead https://youtube.com/watch?v=B_87kmAAlRw