--- kdebase/kdesktop/lock/lockprocess.cc.tooltips	2012-08-10 15:16:14.047229047 +0200
+++ kdebase/kdesktop/lock/lockprocess.cc	2012-08-10 15:41:08.433645385 +0200
@@ -960,6 +960,26 @@
 
     setGeometry(0, 0, mRootWidth, mRootHeight);
 
+	// Hack to close all tooltips on screen
+	Window rootWindow = RootWindow(x11Display(), x11Screen());
+	Window parent;
+	Window* children = NULL;
+	Window* child = NULL;
+	unsigned int noOfChildren = 0;
+	XWindowAttributes childAttr;
+	Window childTransient;
+	 
+	if(XQueryTree(x11Display(), rootWindow, &rootWindow, &parent, &children, &noOfChildren) && noOfChildren>0 ) {
+		for (unsigned int i=0; i<noOfChildren; i++) {
+			if (XGetWindowAttributes(x11Display(), children[i], &childAttr) && XGetTransientForHint(x11Display(), children[i], &childTransient)) {
+				if((childAttr.map_state == IsViewable) && (childAttr.override_redirect) && (childTransient)) {
+					XUnmapWindow(x11Display(), children[i]);
+				}
+			}
+		}
+	}
+	
+
     kdDebug(1204) << "Saver window Id: " << winId() << endl;
 }