Tips on configuring Digital Audio output

Hi y'all, I'm trying to get 5.1 surround working from Bazzite, and have run into several dead-ends. The particulars are:
  • Onboard Realtec audio (Gigabyte AORUS Z790)
  • Directly connected via Digital Audio cable to Logitech 5.1 surround system
  • Audio works, but in stereo only, there is no profile available that supports 5.1, and pro audio shows only 2 channels
Any tips for getting this setup properly?
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