diff --git a/modules/services/x11/desktop-managers/kde4.nix b/modules/services/x11/desktop-managers/kde4.nix
index ce3966fb28a..6baa17be9a1 100644
--- a/modules/services/x11/desktop-managers/kde4.nix
+++ b/modules/services/x11/desktop-managers/kde4.nix
@@ -140,10 +140,10 @@ in
         target = "X11/xkb";
       };
 
-    # Enable required DBus services.
+    # Enable helpful DBus services.
     services.hal = mkIf (!isKDE47) { enable = true; };
     services.udisks = mkIf isKDE47 { enable = true; };
-    services.upower = mkIf isKDE47 { enable = true; };
+    services.upower = mkIf (isKDE47 && config.powerManagement.enable) { enable = true; };
 
   };
 
diff --git a/modules/services/x11/desktop-managers/xfce.nix b/modules/services/x11/desktop-managers/xfce.nix
index 89d4b1fd4dd..fa1e4044b14 100644
--- a/modules/services/x11/desktop-managers/xfce.nix
+++ b/modules/services/x11/desktop-managers/xfce.nix
@@ -80,7 +80,10 @@ in
     environment.pathsToLink =
       [ "/share/xfce4" "/share/themes" "/share/mime" "/share/desktop-directories" ];
       
+    # Enable helpful DBus services.
     services.hal = mkIf (!isXfce48) { enable = true; };
+    services.udisks = mkIf isXfce48 { enable = true; };
+    services.upower = mkIf (isXfce48 && config.powerManagement.enable) { enable = true; };
     
   };