try adding PROTON_FORCE_NVAPI=1 to the launch options
this post was submitted on 16 May 2025
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Thanks for the response, I actually figured it out.
If I run GE-Proton9-27, Frame Gen works fine. If I use anything newer than GE-Proton9-27, I get the DLSS option, but only AMD FSR3 Frame Generation - It seems like a regression with recent Proton builds, as it also happens under Steam Proton 10.
I might try running a newer version of Proton when I get time and see if the launch option you've quoted resolves the issue, right now I'm just glad to have Frame Gen working again.