Progress rewrite further

modules/nixos/hardware/gpu/nvidia/default.nix

@@ -0,0 +1,44 @@
+{ config, ... }:
+
+{
+  hardware = {
+    graphics = {
+      enable = true;
+      enable32Bit = true;
+    };
+
+    nvidia = {
+      open = true;
+      modesetting.enable = true;
+      package = config.boot.kernelPackages.nvidiaPackages.beta;
+      nvidiaSettings = false;
+    };
+  };
+
+  boot.kernelParams = [
+    "nvidia_drm.fbdev=1"
+    "nvidia.NVreg_PreserveVideoMemoryAllocations=1"
+  ];
+
+  services.xserver.videoDrivers = [ "nvidia" ];
+
+  environment.sessionVariables = {
+    LIBVA_DRIVER_NAME = "nvidia";
+    GBM_BACKEND = "nvidia-drm";
+    __GLX_VENDOR_LIBRARY_NAME = "nvidia";
+    NVD_BACKEND = "direct";
+  };
+
+  nixpkgs.config.cudaSupport = true;
+  nix = {
+    settings = {
+      substituters = [
+        "https://cuda-maintainers.cachix.org"
+      ];
+      trusted-public-keys = [
+        "cuda-maintainers.cachix.org-1:0dq3bujKpuEPMCX6U4WylrUDZ9JyUG0VpVZa7CNfq5E="
+      ];
+    };
+  };
+}
+