nixos/system/hardware.nix

{ config, pkgs, ... }:
{
  environment.sessionVariables = {
    LIBVA_DRIVER_NAME = "nvidia";
  };

  nixpkgs.config.packageOverrides = pkgs: {
    intel-vaapi-driver = pkgs.intel-vaapi-driver.override { enableHybridCodec = true; };
  };
  hardware = {
    enableRedistributableFirmware = true;
    cpu.intel.updateMicrocode = true;
    graphics = {
      enable = true;
      enable32Bit = true;
      extraPackages = with pkgs; [
        vaapiVdpau
        mangohud
        nvidia-vaapi-driver
        intel-media-driver
        intel-vaapi-driver
        libvdpau-va-gl
      ];
      extraPackages32 = with pkgs.pkgsi686Linux; [
        mangohud
        intel-media-driver
        intel-vaapi-driver
      ];

    };
    nvidia = {
      modesetting.enable = true;
      powerManagement.enable = false;
      powerManagement.finegrained = false;
      open = true;
      nvidiaSettings = true;
      package = config.boot.kernelPackages.nvidiaPackages.beta;
    };
  };
}