I have the HDMI out of my Yamaha RX-567 receiver going into my Xbox One and then the HDMI out from the Xbox One to the television as it is shown in the setup guide. I then connected an optical cable from the Xbox One back to the receiver. With this setup, I can see my DirecTV video through the Xbox one, but I get no TV audio. I am getting Xbox audio, but no TV sound. On the receiver, I can change the audio input on the receiver for the HDMI port to receive audio from either the HDMI cable or the optical input. When set to the HDMI cable, I get DirecTV sound as expected, but no Xbox sound.. Went set to the optical input, I get Xbox sound, but no DirecTV audio.
I would assume (and we should all know what that means) that the Xbox would receive the DirecTV audio via HDMI and then rebroadcast it over the optical port, but this seems not to be the case. I'll do a bit of testing by removing the receiver from the HDMI path to see what happens, but this seems like a pretty big shortcoming of the passthrough on the Xbox. One begins to wonder what kind of real-world testing they did with the Xbox one during development to have overlooked something as fundamental as this.
The only thing that I can see that might be causing this issue is the receiver itself. If changing the HDMI port audio input to optical is disabling the HDMI audio passthrough, that would cause these symptoms. I guess that I should also give Yamaha a call to see what they can tell me.
If anyone else has some other ideas, I'm all ears or, in this case, eyes!