nvidia driver on foureighty

nixos/boxes/foureighty/default.nix

@@ -5,6 +5,7 @@
   imports = [
     inputs.nixos-hardware.nixosModules.lenovo-thinkpad-t480
     ./hardware-configuration.nix
+    ./nvidia.nix
     ../../boot.nix
     ../../common.nix
     ../../gfx-intel.nix

nixos/boxes/foureighty/nvidia.nix

@@ -0,0 +1,25 @@
+{ pkgs, ... }:
+
+let
+  nvidia-offload = pkgs.writeShellScriptBin "nvidia-offload" ''
+    export __NV_PRIME_RENDER_OFFLOAD=1
+    export __NV_PRIME_RENDER_OFFLOAD_PROVIDER=NVIDIA-G0
+    export __GLX_VENDOR_LIBRARY_NAME=nvidia
+    export __VK_LAYER_NV_optimus=NVIDIA_only
+    exec -a "$0" "$@"
+  '';
+in
+  {
+    environment.systemPackages = [ nvidia-offload ];
+
+    services.xserver.videoDrivers = [ "nvidia" ];
+    hardware.nvidia.prime = {
+      offload.enable = true;
+
+    # Bus ID of the Intel GPU. You can find it using lspci, either under 3D or VGA
+    intelBusId = "PCI:0:2:0";
+
+    # Bus ID of the NVIDIA GPU. You can find it using lspci, either under 3D or VGA
+    nvidiaBusId = "PCI:1:0:0";
+  };
+}