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;
    # opengl.extraPackages = with pkgs; [ nvidia-vaapi-driver ];

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

  # environment.variables = {
  #   GBM_BACKEND = "nvidia-drm";
  #   LIBVA_DRIVER_NAME = "nvidia";
  #   __GLX_VENDOR_LIBRARY_NAME = "nvidia";
  # };

  environment.systemPackages = with pkgs; [ 
    # Fingerprint software
    fprintd 
    # nVidia graphcis options
    # vulkan-loader
    # vulkan-validation-layers
    # vulkan-tools
  ];
}