I have the same situation.
Also seeing the same issue here on an RX 570 with Mesa 20.3.4. Setting PROTON_ENABLE_NVAPI=0 %command% as a launch option does not help either.
It's a known issue, and should hopefully be resolved soon.
https://github.com/ValveSoftware/Proton/pull/4878#issuecomment-853373269
Thanks for reporting. This should be fixed in an Experimental update that just went live (version experimental-6.3-20210602b).
Latest update fixed it for me!
Likewise.
The issue is resolved for me after updating. Thanks!
proton experimentalx1 2021-06PROTON_ENABLE_NVAPI=0x1 2021-06PROTON_ENABLE_NVAPI=0 %command%x1 2021-06
Proton Experimental (Build ID 6802103)
I cannot launch any games with the latest Proton Experimental as I get the following error:
I have an AMD card and it should not be looking for "nvidia" anything.