I have added the requested line to USB-Audio.conf, and it has succeeded in removing the spurious "Digital Output" entry from the Sound Settings!
However, the headset is still identified as "Speakers" in the Sound Settings, instead of "Headphones" (even though the icon is a headset). ** Changed in: alsa-lib (Ubuntu) Status: Incomplete => Confirmed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/975941 Title: [soundnua]: Spurious "Digital Output S/PDIF" output entry for USB headset To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/alsa-lib/+bug/975941/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs