Create specialisation for dGPU PRIME Offload mode

modules/nixos/hardware/nvidia/default.nix

@@ -16,64 +16,50 @@ in {
   };
 
   config = mkIf cfg.enable {
-    # Enable OpenGL
-    hardware.opengl = {
-      enable = true;
-      driSupport = true;
-      driSupport32Bit = true;
-    };
-
-    # Load nvidia driver for Xorg and Wayland
-    services.xserver.videoDrivers = ["nvidia"];
+    specialisation = {
+      dGPU.configuration = {
+        system.nixos.tags = ["dGPU"];
+        # Load nvidia driver for Xorg and Wayland
+        services.xserver.videoDrivers = ["nvidia"];
 
-    hardware.nvidia = {
-      # Modesetting is required.
-      modesetting.enable = true;
+        hardware.nvidia = {
+          # Modesetting is required.
+          modesetting.enable = true;
 
-      prime = {
-        # Make sure to use the correct Bus ID values for your system!
-        intelBusId = "PCI:0:2:0";
-        nvidiaBusId = "PCI:1:0:0";
+          prime = {
+            # Make sure to use the correct Bus ID values for your system!
+            intelBusId = "PCI:0:2:0";
+            nvidiaBusId = "PCI:1:0:0";
 
-        # Enable PRIME Offload
-        offload = {
-          enable = true;
-          enableOffloadCmd = true;
-        };
-      };
+            # Enable PRIME Offload
+            offload.enable = lib.mkForce true;
+            offload.enableOffloadCmd = lib.mkForce true;
+            sync.enable = lib.mkForce false;
+          };
 
-      # Nvidia power management. Experimental, and can cause sleep/suspend to fail.
-      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;
+          # Nvidia power management. Experimental, and can cause sleep/suspend to fail.
+          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;
+          # 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;
+          # 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;
+          # Optionally, you may need to select the appropriate driver version for your specific GPU.
+          package = config.boot.kernelPackages.nvidiaPackages.stable;
+        };
+      };
     };
-
-    # specialisation = {
-    #   on-the-go.configuration = {
-    #     system.nixos.tags = ["on-the-go"];
-    #     hardware.nvidia = {
-    #       prime.offload.enable = lib.mkForce true;
-    #       prime.offload.enableOffloadCmd = lib.mkForce true;
-    #       prime.sync.enable = lib.mkForce false;
-    #     };
-    #   };
-    # };
   };
 }