diff -up libxfce4ui-4.12.1/libxfce4kbd-private/xfce-shortcuts-grabber.c.z-libxfce4ui-multimedia-keys-press-fix libxfce4ui-4.12.1/libxfce4kbd-private/xfce-shortcuts-grabber.c
--- libxfce4ui-4.12.1/libxfce4kbd-private/xfce-shortcuts-grabber.c.z-libxfce4ui-multimedia-keys-press-fix
+++ libxfce4ui-4.12.1/libxfce4kbd-private/xfce-shortcuts-grabber.c
@@ -68,6 +68,7 @@ static GdkFilterReturn xfce_shortcuts_gr
 struct _XfceShortcutsGrabberPrivate
 {
   GHashTable *keys;
+  GHashTable *pressed_keys;
 };
 
 struct _XfceKey
@@ -112,6 +113,7 @@ xfce_shortcuts_grabber_init (XfceShortcu
 {
   grabber->priv = XFCE_SHORTCUTS_GRABBER_GET_PRIVATE (grabber);
   grabber->priv->keys = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, g_free);
+  grabber->priv->pressed_keys = g_hash_table_new_full (g_direct_hash, g_direct_equal, NULL, NULL);
 
   /* Workaround: Make sure modmap is up to date
    * There is possibly a bug in GTK+ where virtual modifiers are not
@@ -136,6 +138,8 @@ xfce_shortcuts_grabber_constructed (GObj
                     grabber);
 
   display = gdk_display_get_default ();
+  
+  XkbSetDetectableAutoRepeat(GDK_DISPLAY_XDISPLAY (display), TRUE, NULL);
 
   /* Flush events before adding the event filter */
   XAllowEvents (GDK_DISPLAY_XDISPLAY (display), AsyncBoth, CurrentTime);
@@ -153,6 +157,7 @@ xfce_shortcuts_grabber_finalize (GObject
 
   xfce_shortcuts_grabber_ungrab_all (grabber);
   g_hash_table_unref (grabber->priv->keys);
+  g_hash_table_unref (grabber->priv->pressed_keys);
 
   (*G_OBJECT_CLASS (xfce_shortcuts_grabber_parent_class)->finalize) (object);
 }
@@ -409,9 +414,17 @@ xfce_shortcuts_grabber_event_filter (Gdk
 
   xevent = (XEvent *) gdk_xevent;
 
+  if (xevent->type == KeyRelease)
+    g_hash_table_remove (grabber->priv->pressed_keys, GINT_TO_POINTER (xevent->xkey.keycode));
+
   if (xevent->type != KeyPress)
     return GDK_FILTER_CONTINUE;
 
+  if (g_hash_table_contains (grabber->priv->pressed_keys, GINT_TO_POINTER (xevent->xkey.keycode)))
+    return GDK_FILTER_CONTINUE;
+  
+  g_hash_table_add (grabber->priv->pressed_keys, GINT_TO_POINTER (xevent->xkey.keycode));
+  
   context.grabber = grabber;
   context.result = NULL;
   timestamp = xevent->xkey.time;