conf: No SPDIF on Plantronics 3220 headset

alsa-project/alsa-lib pull request #126 was opened from drjhe:

The Plantronics Blackwire 3220 Series headset (USB ID 047f:c056) shows up in GNOME Settings with a non-existent digital output. Add it to the list to suppress this.

Request URL : https://github.com/alsa-project/alsa-lib/pull/126 Patch URL : https://github.com/alsa-project/alsa-lib/pull/126.patch Repository URL: https://github.com/alsa-project/alsa-lib