{ 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_beta ];
  # boot.extraModulePackages = [ config.boot.kernelPackages.nvidia_x11 ];


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

  boot.kernelParams = [
    "amdgpu.modeset=1"
    "nvidia-drm.fbdev=1"
    "nvidia-drm.modeset=0"
  #  "nvidia.NVreg_PreserveVideoMemoryAllocations=0"
    "amd_iommu=on"
    # "vfio-pci.ids=\"10de:2489,10de:228b\""
    # "nomodeset"
  #  "nvidia_drm.modeset=1"
  ];
  boot.blacklistedKernelModules = [ 
    "i915" 
    "nouveau"
    # "nvidia"
    # "nvidia-drm"
    # "nvidia-uvm"
    # "nvidiafb"
    # "nvidia_drm"
    # "nvidia_modeset"
  ];
  # boot.extraModprobeConfig = ''
    # blacklist nvidia
    # blacklist nvidia-drm
    # blacklist nvidia_drm
    # blacklist nvidia-uvm
    # blacklist nvidia_uvm
    # blacklist nvidia_modeset
    # blacklist nvidiafb
    # blacklist nouveau
    # options nouveau modeset=0
  # '';
  boot.extraModprobeConfig = ''
    blacklist nouveau
    options nouveau modeset=0
  '';
  # services.xserver.videoDrivers = [ "nvidia" ];
  services.xserver.videoDrivers = [ "amdgpu" "nvidia" ];

  # services.udev.extraRules = ''
  #   # Remove NVIDIA USB xHCI Host Controller devices, if present
  #   ACTION=="add", SUBSYSTEM=="pci", ATTR{vendor}=="0x10de", ATTR{class}=="0x0c0330", ATTR{power/control}="auto", ATTR{remove}="1"
  #   # Remove NVIDIA USB Type-C UCSI devices, if present
  #   ACTION=="add", SUBSYSTEM=="pci", ATTR{vendor}=="0x10de", ATTR{class}=="0x0c8000", ATTR{power/control}="auto", ATTR{remove}="1"
  #   # Remove NVIDIA Audio devices, if present
  #   ACTION=="add", SUBSYSTEM=="pci", ATTR{vendor}=="0x10de", ATTR{class}=="0x040300", ATTR{power/control}="auto", ATTR{remove}="1"
  #   # Remove NVIDIA VGA/3D controller devices
  #   ACTION=="add", SUBSYSTEM=="pci", ATTR{vendor}=="0x10de", ATTR{class}=="0x03[0-9]*", ATTR{power/control}="auto", ATTR{remove}="1"
  # '';

  boot.initrd.kernelModules = [ 
    "amdgpu"
    "nvidia"  
    # "nvidia-drm"
    "nvidiafb"
    # "nvidia-uvm"
    # "nvidia-modeset"
    # "i2c-nvidia_gpu"    
  ];  
  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 = true;

    # 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.beta;
    # package = config.boot.kernelPackages.nvidiaPackages.none;
    # package = config.boot.kernelPackages.nvidiaPackages.production;
    
    forceFullCompositionPipeline = false;

    prime = {
      offload = {
        enable = true;
        enableOffloadCmd = true;
      };
      reverseSync.enable = false;
      # Make sure to use the correct Bus ID values for your system!
      # intelBusId = "PCI:0:2:0";
      nvidiaBusId = "PCI:01:0:0";
      amdgpuBusId = "PCI:50:0:0"; #For AMD GPU
    };

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