描述：Ubuntu 21.10 / 代号：impish
如果有必要的话，运行 LXDE
我通过外部 USB 扬声器观看 YouTube，声音播放得很好。
突然间，它们安静下来了，并且无需我的干预，插入的耳机（Plantronics, Inc. DA40 适配器）上就会播放声音......
我在切换时确实通过 journalctl 看到了一些日志：
Mar 01 10:04:57 wilddog pulseaudio[1678]: ALSA woke us up to write new data to the device, but there was actually nothing to write.
Mar 01 10:04:57 wilddog pulseaudio[1678]: Most likely this is a bug in the ALSA driver 'snd_usb_audio'. Please report this issue to the ALSA developers.
Mar 01 10:04:57 wilddog pulseaudio[1678]: We were woken up with POLLOUT set -- however a subsequent snd_pcm_avail() returned 0 or another value < min_avail.
这是一个相当新的安装。
我怎样才能使其在外部扬声器上保持稳定？