Index: /trunk/src/VBox/Frontends/VirtualBox/src/runtime/UIMachineLogic.cpp
===================================================================
--- /trunk/src/VBox/Frontends/VirtualBox/src/runtime/UIMachineLogic.cpp	(revision 50353)
+++ /trunk/src/VBox/Frontends/VirtualBox/src/runtime/UIMachineLogic.cpp	(revision 50354)
@@ -1102,12 +1102,15 @@
                 case QEvent::WindowActivate:
                 {
+#ifdef Q_WS_WIN
                     /* We should save current lock states as *previous* and
                      * set current lock states to guest values we have,
                      * As we have no ipc between threads of different VMs
-                     * we are using 300ms timer as lazy sync timout: */
-                    //QTimer::singleShot(300, this, SLOT(sltSwitchKeyboardLedsToGuestLeds()));
-
+                     * we are using 100ms timer as lazy sync timout: */
+                    keyboardHandler()->winSkipKeyboardEvents(true);
+                    QTimer::singleShot(100, this, SLOT(sltSwitchKeyboardLedsToGuestLeds()));
+#else /* Q_WS_WIN */
                     /* Trigger callback synchronously for now! */
                     sltSwitchKeyboardLedsToGuestLeds();
+#endif /* !Q_WS_WIN */
                     break;
                 }