That rather odd.  I don’t believe there is any ‘opening’ function per se, but there does need to be a handshake between the TV and Arc.  I would try a cold boot of the TV.  Unplug it for about 10 seconds or so then plug it back in.  Insure the TV is set to use the ARC connection for audio and see if you can reduce the issue.  I wouldn’t be too surprised if that fixes the  issue.

I’d also look to see that the TV firmware is up to date.

Hi Danny,

Unfortunately, I have tried all of this before, and it doesn’t fix the issue.

It is most certainly a software bug in the Sonos Arc, as this never happened with the Beam.

If product management is monitoring this, happy to send more detail so you can fine-tune this. Otherwise, I will have to return the Arc...as I don’t want to keep clicking onto HDMI 2 (the Arc HDMI) to handshake and open the sound, and then out of it back to Apple TV every time I turn the TV on.

Regards,

James

If this was a sonos software issue, it would likely show up irrespective of the brand of the display. I'd bet my money it'll require a firmware update on your display related to hdmi eARC processing. I replaced a Beam with the Arc and don't have the issue with LG C9 display. 

Hi GC,

I am not sure this is relevant as my LG doesn’t have an HDMI eARC, it’s just an HDMI ARC supporting Dolby Digital plus. As mentioned, I didn’t have this issue at all with the Beam, albeit with the LG being set to Dolby Digital and not DD plus with the beam, as it isn’t supported.

I have tested the Arc with Dolby Digital output set on the TV (like as it was for the Beam), with the same result.

Regards 

Hi All,

For those of you still watching this thread, I found a workaround and a fix to this ...I think!

WORKAROUND: Enable standby mode on the LG TV to it only goes into standby and never entirely turns off. This preserves the audio setting.

FIX: Do an AV reset on the LG tv by pressing mute three times. I didn’t have to do this for the Beam but seems to have worked for this situation. 

I hope this helps!