nix/hosts/nixos-laptop/configuration.nix

{ lib, config, pkgs, ... }: {

  # Set your time zone.
  time.timeZone = "Asia/Tokyo";

  # Set the networking hostname:
  networking.hostName = "nixos-laptop";

  # Configure the fingerprint reader
  services.fprintd = { 
    enable = true;
    tod.enable = true;
    tod.driver = pkgs.libfprint-2-tod1-vfs0090;
  };

  # Enable nVidia PRIME Render Offload and OpenGL
  # https://github.com/NixOS/nixos-hardware/blob/master/lenovo/thinkpad/p1/3th-gen/nvidia.nix
  hardware = {
    opengl.enable = true;
    opengl.driSupport32Bit = true;
    opengl.driSupport = true;

    nvidia = { 
      open = true;
      # powerManagement.enable = true;
      # modesetting.enable = true;
      prime = {
        reverseSync.enable = true;
        intelBusId = lib.mkDefault "PCI:0:2:0";
        nvidiaBusId = lib.mkDefault "PCI:1:0:0";
      };
    };
  };

  # Enable nVidia graphics
  services.xserver.videoDrivers = [ "nvidia" ];

  environment.systemPackages = with pkgs; [ 
    # Fingerprint software
    fprintd 
  ];
}