public function prePersist(LifecycleEventArgs $args) //the first entity will have the PMP, so we catch it and continue to skip this if after this **/它保存了我的层次结构中的所有东西,甚至是一个新的PMP</
通过查看/var/log/messages,我在引导时看到了插入麦克风的情况:Mar 28 08:19:04 foobar kernel: usb 6-2: New USB device found, idVendor=08bb, idProduct=2912
Mar 28 08:19:04 foobar kernel: usb 6-