talos: configure nvidia GPU

hosts/talos/configuration.nix

@@ -1,4 +1,5 @@
 {
+  config,
   pkgs,
   lib,
   name,
@@ -16,6 +17,31 @@
 
   services.thermald.enable = true;
 
+  nixpkgs.config.allowUnfreePredicate =
+    pkg:
+    builtins.elem (lib.getName pkg) ([
+      "nvidia-x11"
+      "nvidia-settings"
+      "nvidia-kernel-modules"
+    ]);
+  services.xserver.videoDrivers = [ "nvidia" ];
+  hardware.nvidia = {
+    # NVIDIA Quadro P3200 is a Pascal Series card: https://en.wikipedia.org/wiki/List_of_Nvidia_graphics_processing_units#Quadro_Pxxx_series
+    # Latest driver for Pascal is 580: https://nvidia.custhelp.com/app/answers/detail/a_id/5706/~/nvidia-quadro-support-plan-for-maxwell%2C-pascal%2C-and-volta-gpus.
+    package = config.boot.kernelPackages.nvidiaPackages.legacy_580;
+    modesetting.enable = true;
+    powerManagement.enable = false;
+    powerManagement.finegrained = false;
+    # Turing or newer required for open kernel module driver: https://wiki.archlinux.org/title/NVIDIA#Installation
+    open = false;
+    nvidiaSettings = true;
+  };
+  hardware.nvidia.prime = {
+    sync.enable = true;
+    intelBusId = "PCI:0:2:0";
+    nvidiaBusId = "PCI:1:0:0";
+  };
+
   fonts.fontconfig.enable = true;
   fonts.fontconfig.defaultFonts = {
     monospace = [