this post was submitted on 14 May 2025
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Linux Gaming
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If you're using proton, then you're not using the native linux clients you're using the Windows clients.
But, to answer your question, if you want to see if you're using HDR it will depend on the game. For a method that is game agnostic, install mangohud: https://github.com/flightlessmango/MangoHud which will let you see all kinds of information about the game that's running (often used for FPS/temps).
If you'd rather use a GUI instead of editing the config files, you can use goverlay: https://github.com/benjamimgois/goverlay
Mangohud is great, but last time I checked the hdr option it can show only works on gamescope, so if you’re using any other compositor it won’t be accurate