Headphone volume resets itself to 100%

2

Not really an answer to your question, but I recommend using Pipewire with Pulseaudio emulation.

{
  hardware.pulseaudio.enable = false;
  security.rtkit.enable = true;
  services.pipewire = {
    enable = true;
    alsa.enable = true;
    alsa.support32Bit = true;
    pulse.enable = true;
  };
}

I do not recommend using the Jack emulation (services.pipewire.jack.enable = true) at this point because it uses LD_LIBRARY_PATH which breaks some applications (Evolution, epiphany: Webkitgtk bubblewrapper crashes when LD_LIBRARY path points into /run/current-system/** (the case on a pipewire system with jack emulation) · Issue #110468 · NixOS/nixpkgs · GitHub).

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