Not sure if crossposting is cool, but I'm making an attempt to fix my Steam Link audio issues.
Steam Link works find with multiple Windows PCs under our current configurations, our receiver is able to play Stereo 5:1 just fine with any of them...but whenever I use my new PC with Linux Mint OS it seems to be having some trouble. I've used a few things like helvum, pavucontrol, and qpwgraph to help me determine that...well, absolutely everything looks fine.

The HDA Nvidia Digital monitor end of everything is connected to the input end of Steam on all channels...and we can get sound to come through but only the Left Front speaker and the Center Front (from TV). All the others sounds like they're trying to play from the subwoofer. Again, this configuration isn't the reciever's fault, as any other input produces the sound appropriately...it is only when this PC in particular is streaming to the Steam Link.

Does anybody have any ideas? I can provide further info. I was thinking that since there isn't a Steam Streaming Speaker output like what appears when I use a Windows OS with the Steam Link that it could be related but forums have said that Linux doesn't use it anyways? I don't know.