OK, some progress... It seems that the kernel is reporting your Nintendo USB microphone as an output device. And PulseAudio always prioritizes recently-attached USB output devices. So PulseAudio is behaving correctly.
If the microphone is not meant to also act as a speaker then this is a kernel bug. ** No longer affects: gnome-settings-daemon (Ubuntu) ** No longer affects: gnome-control-center (Ubuntu) ** No longer affects: mate-control-center (Ubuntu) ** No longer affects: mate-settings-daemon (Ubuntu) ** Also affects: linux (Ubuntu) Importance: Undecided Status: New ** Changed in: pulseaudio (Ubuntu) Status: Incomplete => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1748620 Title: PulseAudio defaults audio output to the USB microphone (Nintendo WUP-021-0) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1748620/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs