I have my TV HDMI-3 with eARC hooked up to my Onkyo eARC input and hear sound when displaying my computer-HDMI output as well as when I select 'live' TV. However when I press the special button for AmazonPrime, I get video but no audio.
The receiver auto switches to TV-in when I press AmazonPrime as it does when I switch to live-TV as well.
