It has been a couple weeks since i played, so I am not sure if patch 4 has anything to do with it. I have not found any posts about it not working on linux, so i was wondering if anyone else on linux or debian having trouble?
edit: I switched to proton experimental and it works
You don’t need the launcher. You can run bg3_dx11.exe directly. You will need DXVK, of course, though that’s already present if you’re running it from Steam.