Update

hosts/modules/nvidia.nix

@@ -46,6 +46,7 @@ in {
         nvidia-vaapi-driver
         vaapiVdpau
         libvdpau-va-gl
+        mesa
       ];
     };
   };

hosts/modules/prime.nix

@@ -1,11 +1,11 @@
 {
   hardware.nvidia.prime = {
-    # offload = {
-    #   enable = true;
-    #   enableOffloadCmd = true;
-    # };
+    offload = {
+      enable = true;
+      enableOffloadCmd = true;
+    };
 
-    sync.enable = true;
+    # sync.enable = true;
 
     amdgpuBusId = "PCI:5:0:0";
     nvidiaBusId = "PCI:1:0:0";

hosts/modules/usb.nix

@@ -0,0 +1,23 @@
+{ pkgs, ... }:
+
+{
+  # USB Automounting
+  services.gvfs.enable = true;
+  # services.udisks2.enable = true;
+  # services.devmon.enable = true;
+
+  # Enable USB Guard
+  services.usbguard = {
+    enable = true;
+    dbus.enable = true;
+    implicitPolicyTarget = "block";
+    # FIXME: set yours pref USB devices (change {id} to your trusted USB device), use `lsusb` command (from usbutils package) to get list of all connected USB devices including integrated devices like camera, bluetooth, wifi, etc. with their IDs or just disable `usbguard`
+    rules = ''
+      allow id {id} # device 1
+      allow id {id} # device 2
+    '';
+  };
+
+  # Enable USB-specific packages
+  environment.systemPackages = with pkgs; [ usbutils ];
+}