I just installed NixOS 26.11 (Zokor) a week ago. I’ve gone through a lot of forum posts and tried the commonly suggested fixes (kernel params, extraConfig, etc.). Those seem to work for a lot of people, but not in my case.
At this point I think the issue might be with the codec, although I could be wrong. I don’t think it’s a firmware issue, but here’s my hardware information and the relevant audio configuration. https://pastebin.com/hf1hBJrq