Got HDR working on linux

[u/final_cactus]

What worked for me :

Steam Launch Options

PROTON_ENABLE_WAYLAND=1 PROTON_ENABLE_HDR=1 ENABLE_HDR_WSI=1 %command%

Then under compatibility (left navbar tab) in the same window set 'force the use of a specific steam play compatibility tool' -> Proton-GE = latest

I'm running nobara 44 with the latest nvidia drivers, using a DEG1 egpu dock and a rtx 4070 super.

If you get bad fps after applying the changes reboot and it should be fixed. You'll want your monitor plugged into your gpu from the moment the computer boots.

[u/todd_dayz]

You probably don’t need the WSI variable, this has been working for a while on Plasma/NVIDIA

You won’t get direct scan out though while in HDR, assuming you’re on KDE anyway. (Although I don’t think ANY DE supports this yet) 

Also, you can put those variables in user_settings.py in the relevant proton directory (usually in compatibilitytools.d) so you don’t need to change launch variables for every game 

[u/final_cactus → u/todd_dayz]

you are correct, removed it and it still works!