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Same issue here, also kde plasma, amd gpu/cpu and cachyOS linux and an qd-oled HDR 10 monitor. in the proton build HDR does work
Lots of people and companies have already asked for this and the issue is that AMD is using a specific directx12 thingy/api for FSR 4 and linux...
On my linux system the issues are: - HDR not functioning properly compared to the proton version - UI (especially scrolling) being irresponsive...