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

  # Enable OpenGL
  hardware.graphics = {
    enable = true;
    extraPackages = with pkgs; [ nvidia-vaapi-driver ];
  };

  # Load nvidia driver for Xorg and Wayland
  # boot.extraModulePackages = [ config.boot.kernelPackages.nvidia_x11 ];
  # boot.extraModulePackages = [ config.boot.kernelPackages.nvidia_x11_production ];
  boot.extraModulePackages = [ config.boot.kernelPackages.nvidia_x11 ];


  boot.loader.systemd-boot.consoleMode = "max";

  boot.kernelParams = [
   "nvidia-drm.fbdev=1"
   "nvidia-drm.modeset=1"
   "nvidia.NVreg_PreserveVideoMemoryAllocations=1"
   "nomodeset"
  #  "nvidia_drm.modeset=1"
  ];
  boot.blacklistedKernelModules = [ 
    "i915" 
    "amdgpu"
    "nouveau"    
  ];
  boot.extraModprobeConfig = ''
    blacklist nouveau
    options nouveau modeset=0
  '';
  services.xserver.videoDrivers = [ "nvidia" ];
  boot.initrd.kernelModules = [ 
    "nvidia" 
    "nvidia-drm"
    # "nvidiafb"
    # "nvidia-modeset"
    # "nvidia-uvm"
    # "i2c-nvidia_gpu"
    ];
  #boot.initrd.kernelModules = [ "nvidia" ];
  

  hardware.nvidia = {
    # Modesetting is required.
    modesetting.enable = true;

    # Nvidia power management. Experimental, and can cause sleep/suspend to fail.
    # Enable this if you have graphical corruption issues or application crashes after waking
    # up from sleep. This fixes it by saving the entire VRAM memory to /tmp/ instead 
    # of just the bare essentials.
    powerManagement.enable = false;

    # Fine-grained power management. Turns off GPU when not in use.
    # Experimental and only works on modern Nvidia GPUs (Turing or newer).
    powerManagement.finegrained = false;

    # Use the NVidia open source kernel module (not to be confused with the
    # independent third-party "nouveau" open source driver).
    # Support is limited to the Turing and later architectures. Full list of 
    # supported GPUs is at: 
    # https://github.com/NVIDIA/open-gpu-kernel-modules#compatible-gpus 
    # Only available from driver 515.43.04+
    # Currently alpha-quality/buggy, so false is currently the recommended setting.
    open = false;

    # Enable the Nvidia settings menu,
	# accessible via `nvidia-settings`.
    nvidiaSettings = true;

    # Optionally, you may need to select the appropriate driver version for your specific GPU.
    package = config.boot.kernelPackages.nvidiaPackages.stable;
    # package = config.boot.kernelPackages.nvidiaPackages.production;

  };
  users.users.andreas = {
   extraGroups = [ "video" "render" ];
  };
}