Quoting: Goggo66The DX12 issue seems to be fixed. Use Proton Hotfix.
Looks great with good performance thanks to FSR.

Concur, this worked, however I could only get raytracing options to populate if I used VVKD3D_CONFIG=dxr in the launch parameters, and the game hangs once the save loads. Without that parameter, DX12 version loads fine and FSR2 works, but DLSS does not. I'll stick to DX11 for now until we get some more proton fixes. I can get raytracing to work in CP77 (with that launch parameter), and it worked out of the box for Portal RTX...

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OK I gave it a go on: Ryzen 5 5600X + RTX2060 + 16gb Ram on Pop_OS 22.04. For anyone wondering, go into Pop!Shop and Installed tab and click Install on the nvidia-driver-525 option. I used Proton Experimental (proton GE didn't work).In-game reoslution set to 720P, then I quit out and put -windowed -noborder in the launch param to play at 720p windowed from the desktop.
In-Game: You can hit Alt-X to bring up a Reshade menu. You can quick toggle between High and Ultra, but you can also enable the developer options, and then toggle DLSS to Ultra Performance if you want. Anyway, at "DLSS Auto" and Ultra, I get like 22fps in most test chambers. The elevator areas rocket up to 40fps. Turn on DLSS Ultra Performance and I get what feels like 60fps.
This is a curiosity, a demo. IMO it doesn't show off raytracing that well because most rooms are statically-lit. It's nice that I didn't have to dip into my bios and load Windows to try this out, however!

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