NVidia on Dell with NixOS

  # Video Settings & Drivers
  services.xserver.dpi = 100;
  fonts.fontconfig.dpi = 100;
  # 1. does not work
  # boot.kernelModules = [ "nvidia_x11" ];
  # services.xserver.videoDrivers = [ "nvidia" ];
  # boot.extraModulePackages = [ config.boot.kernelPackages.nvidia_x11 ];
  # 2. only "intel" works
  # services.xserver.videoDrivers = [ "intel" "nvidia" ];
  # 3. optimus prime mode ;)
  services.xserver.videoDrivers = [ "nvidia" ];
  hardware.nvidia.optimus_prime.enable = true;
  # Bus ID of the NVIDIA GPU. You can find it using lspci;
  # for example if lspci shows the NVIDIA GPU at "01:00.0", set this option to "PCI:1:0:0".
  hardware.nvidia.optimus_prime.nvidiaBusId = "PCI:1:0:0";
  # Bus ID of the Intel GPU. You can find it using lspci;
  # for example if lspci shows the Intel GPU at "00:02.0", set this option to "PCI:0:2:0".
  hardware.nvidia.optimus_prime.intelBusId = "PCI:0:2:0";