[Altair] Disable device auto-sleep for xpadneo/bluetooth.

system/features/virtualbox.nix

@@ -0,0 +1,4 @@
+_: {
+  virtualisation.virtualbox.host.enable = true;
+  users.extraGroups.vboxusers.members = [ "drew" ];
+}

system/hosts/altair/default.nix

@@ -1,18 +1,19 @@
 { ... }:
 {
   imports = [
-    ./configuration.nix
-    ./hardware-configuration.nix
-    ./qmk.nix
     ../../authorized-keys.nix
+    ../../features/android-dev.nix
     ../../features/appimage.nix
     ../../features/audio.nix
     ../../features/bluetooth.nix
+    ../../features/container-dev.nix
+    ../../features/flatpak.nix
     ../../features/gc.nix
     ../../features/gui.nix
-    ../../features/container-dev.nix
-    ../../features/android-dev.nix
-    ../../features/flatpak.nix
+    ../../features/virtualbox.nix
+    ./configuration.nix
+    ./hardware-configuration.nix
+    ./qmk.nix
   ];
 
   nixpkgs.config.allowUnfree = true;

system/hosts/altair/hardware-configuration.nix

@@ -34,9 +34,11 @@
     extraModulePackages = [ ];
 
     # disable_ertm is required for xpadneo to connect properly and establish a
-    # data connection.
+    # data connection.  enable_autosuspend is to prevent Linux from putting the
+    # BT radio to sleep and causing a disconnect.
     extraModprobeConfig = ''
       options bluetooth disable_ertm=1
+      options btusb enable_autosuspend=0
     '';
   };