--- /usr/share/gnome-shell/js/ui/userMenu.js	2013-04-05 20:24:55.000000000 +0200
+++ /home/gerstrong/userMenu.js	2013-04-15 08:41:19.485161937 +0200
@@ -21,6 +21,7 @@ const ModalDialog = imports.ui.modalDial
 const PanelMenu = imports.ui.panelMenu;
 const PopupMenu = imports.ui.popupMenu;
 const Params = imports.misc.params;
+//const UnlockDialog = imports.ui.unlockDialog;
 const Util = imports.misc.util;
 
 const LOCKDOWN_SCHEMA = 'org.gnome.desktop.lockdown';
@@ -867,7 +868,11 @@ const UserMenuButton = new Lang.Class({
         Main.overview.hide();
         if (Main.screenShield)
             Main.screenShield.lock(false);
-        Gdm.goto_login_session_sync(null);
+//        Gdm.goto_login_session_sync(null);
+//        if (UnlockDialog.isSupported())
+//            Gdm.goto_login_session_sync(null);
+//        else
+            this._lightdmLoginSession();
     },
 
     _onQuitSessionActivate: function() {
@@ -994,5 +999,19 @@ const UserMenuButton = new Lang.Class({
             this.menu.close(BoxPointer.PopupAnimation.NONE);
             this._loginManager.suspend();
         }
-    }
+//  }  
+    },		
+    _lightdmLoginSession: function() {
+        try {
+            let seat = GLib.getenv("XDG_SEAT_PATH");
+            let result = Gio.DBus.system.call_sync('org.freedesktop.DisplayManager',
+                                               seat,
+                                               'org.freedesktop.DisplayManager.Seat',
+                                               'SwitchToGreeter', null, null,
+                                               Gio.DBusCallFlags.NONE,
+                                               -1, null);
+        } catch(e) {
+            Main.screenShield.lock();
+        }
+}
 });