I ask the above, as my LG 49SM8500PLA TV, which I've had for about a year or so, routinely throws two hissy fits (not at the same time, from what I've noticed): 1) It flags Freeview channels as having 5.1 audio, which is wrong (ITV HD, C5HD, Talking Pictures, etc.) 2) Stuff flagged as having 5.1 audio on Amazon Video and NowTV only plays back in stereo My TV is connected to a Yamaha YSP4100 sound bar. My first thought, given that the bar is perhaps 10 years old, was that it was starting to... LG TVs -- Auto or PassThru for HDMI ARC audio? from AVForums https://ift.tt/2GjKoXq