power-manager-button.c:

680       static void
             power_manager_button_add_all_devices (PowerManagerButton *button)
             {
             GPtrArray *array = NULL;
             guint i;

686      button->priv->display_device = up_client_get_display_device (button->priv->upower);
             power_manager_button_add_device (button->priv->display_device, button);

              array = up_client_get_devices (button->priv->upower);

              if (array)