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I’m on AMD but I already play in HDR without gamescope with Proton-Tkg (Wine master).
For games I then only have to set DISPLAY= ENABLE_HDR_WSI=1 %command%
.
The HDR layer is here: https://github.com/Zamundaaa/VK_hdr_layer
It should not be needed anymore pretty soon.
I’m not a composer but Kimai is indeed a very good time tracker. Beats the trash we use at work.