Prominent Collaborator I

Answered

ARC intermittent connection loss possibly with Atmos only

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Hi all. So far I think this is isolated to Atmos content however randomly while watching Prime Video or Disney content outputting Atmos (through fire stick 4K) I will lose signal (Beam gen 2 and two one sl’s as surround). When it happens I lose sound, the screen flashes and my tv’s LG logo appears for a second before going back to Disney or prime (whatever I’m watching). I can push play and everything works again, but almost seems like something with the HDMI arc input is being “lost” for a split second. Or maybe it’s the signal loss for a split second?

I’ve changed HDMI cords and powered down both the tv and Beam to try and reset but no luck. Randomly happens, sometimes 5 minutes in and other times maybe 15 in. Any ideas?

fyi I recently changed to using SonosNet (beam hardwired Ethernet) as opposed to all wireless is this possibly an issue that anyone knows about?

Setup as follows:

Moderator edit: Removed picture with serial numbers

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RaultTNAnswer

Prominent Collaborator I

Well gentlemen @Ken_Griffiths and @ThatOneDude I think I am marking this as resolved. Made it through the entire Disney + Atmos movie, and now running through an Amazon Prime Atmos show just to make sure but all is working as advertised and nothing cutting our nor any lip sync issues. My System and settings are as follows:

System: LG TV with a Firestick 4K in HDMI 1, Sonos Beam (Gen 2) in HDMI 2 (Arc) both connected via HDMI.

LG TV Settings:

HDMI: ARC

Digital Sound Out: Auto

HDMI Input: all inputs set to Bitstream

Firestick 4K Settings:

Video Resolution: Auto

Match Original Frame Rate: Off

Color Depth: Up to 10 bits

Color Format: Auto

Dynamic Range Setting: Adaptive

Surround Sound: Best Available

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Mr. T

If you switch SonosNet channel in the app, the surrounds should jump across. Give it 30secs or so to take effect.

You can then switch back to the SonosNet channel that it was on.

If that doesn’t work, then try rebooting the surrounds.

Ken_Griffiths

@Mr T Great thought! Let me get Disney+ going through the smart tv directly and see what happens. I guess that would narrow it down to the Firestick if it works.

Side Note: my surrounds have still not shifted back to WM:0 (still at WM:1 wireless) since my last restart but my kitchen Sonos is on WM:0? Minor though I suppose since my Beam is the issue.

I’ll report back after testing direct through smart tv

I would definitely get the surrounds sorted before moving on and doing any further testing. Get all onto SonosNet WM: 0.

RaultTNAuthor

Prominent Collaborator I

@Ken_Griffiths I’m back at all 0’s. Had to restart surrounds but we are back in business on that front.

Mr. T

@Ken_Griffiths A couple of other things I am trying this afternoon. I had two settings I recently changed on my LG. The first is called “Instant Game Response” which was toggled “On” for hdmi1 (fire stick). No idea if it could be the culprit but there is a warning stating “when initiated the video may blink temporarily”. So we’ll see. The other is “HDMI Ultra HD”. It also has a warning about potential issues if device is not supported.

I have also unplugged Ethernet from my beam and now have all devices on Wi-Fi (WM:1) effectively disabling SonosNet (it’s greyed out anyways) so we’ll see how that goes. Fingers crossed.

Going back to this previous comment. I would certainly disable the Instant Game Response for the Fire Stick hdmi port as the Fire Stick is not a games machine.

RaultTNAuthor

Prominent Collaborator I

Thanks @Mr. T I did disable that function once I saw it was on. No dice though unfortunately with this issue.

ThatOneDude

Lyricist III

I have the same issue (the rebooting that is)! Just wanted to let you know you are not alone. Quite annoying isnt it?

Ken_Griffiths

I have another thought @RaultTN - in the TV audio settings, if you goto ‘Sound/Sound Out’ - do you have the option to set ‘HDMI-ARC/Digital Sound Out’ to ‘Pass-Through’ - if it’s currently set to ‘Auto’, change that setting to ‘Pass-Through’ and see if that sorts the issue.

RaultTNAuthor

Prominent Collaborator I

Morning sir. Here are my settings throughout:

LG TV:

Sound Out: HDMI ARC

Digital Sound Out: Pass Through (other options are PCM and Auto)

HDMI Input Audio Format: HDMI 1 (Firestick): Bitstream; HDMI 2 (Beam) Bitstream

Firestick Settings:

Surround Sound Setting: Best Available (other options are PCM, Dolby Digital, and Dolby Digital Plus)

I am currently testing using the smart tv directly for atmos content (Dinsey+). So far no cutouts but im only 5 minutes in. It has taken as long as 20 minutes to happen so I will report back. That would at least narrow it down to the Firestick I would presume (if it indeed does not cut out).

@ThatOneDude Hate to hear it. Its the worst. Does it only happen on Atmos content for you as well? Are you using a Firestick 4K for your streaming?

Ken_Griffiths

Your settings sound fine to me @RaultTN - I have the LG C9 OLED TV and also use a FireTV 4K (not the max version). I use the Fire TV Ethernet adapter too…and I’ve not encountered any issues with the one here.

Anyhow, have you got the latest software installed for the FireTV 4K and also the latest firmware for your LG TV?

If so and the TV Apps play okay - you could perhaps try the FireTV in another HDMI port - mine is actually not linked direct to the TV, I have it plugged into a HDMI switch (with other devices) and the switch is cabled to HDMI-3.

I have ‘cable TV’ plugged into HDMI-1, Sonos Arc in HDMI-2 (set to eARC passthrough) and a Nvidia Shield in HDMI-4 and not seeing any audio interruptions.

Ken_Griffiths

The latest Fire TV OS version I have installed here is showing as 6.2.9.4 (NS6294/4339) If you want to perhaps check that with your Fire TV 4K. (Not sure if it varies across the globe?)

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