Extract AMD-GPU from Nvidia, to make it easier to choose either

lenovo/yoga/7/14ARH7/nvidia/default.nix

@@ -0,0 +1,47 @@
+# Including this file will enable the NVidia driver, and PRIME offload
+
+{ lib, pkgs, ... }:
+
+let
+  inherit (lib) mkDefault;
+
+in {
+  imports = [
+    ../shared.nix
+    ## "prime.nix" loads this, aleady:
+    # ../../../../common/gpu/nvidia
+    ../../../../../common/gpu/nvidia/prime.nix
+  ];
+
+  # NVIDIA GeForce RTX 3050 Mobile (Ampere)
+  services.xserver.videoDrivers = mkDefault [ "nvidia" ];
+
+  hardware = {
+    ## Enable the Nvidia card, as well as Prime and Offload:
+    amdgpu.loadInInitrd = true;
+    opengl.extraPackages = with pkgs; [
+      vaapiVdpau
+      libvdpau-va-gl
+    ];
+
+    nvidia = {
+      modesetting.enable = true;
+      nvidiaSettings = true;
+
+      prime = {
+        offload = {
+          enable = true;
+          enableOffloadCmd = true;
+        };
+        amdgpuBusId = "PCI:4:0:0";
+        nvidiaBusId = "PCI:1:0:0";
+      };
+
+      powerManagement = {
+        enable = true;
+        # Doesn't seem to be reliable, yet?
+        # finegrained = true
+      };
+    };
+  };
+}