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RaultTN
RaultTN
Prominent Collaborator I
January 8, 2023
Answered

ARC intermittent connection loss possibly with Atmos only

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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    RaultTN
    RaultTNAnswer
    Prominent Collaborator I
    January 10, 2023

    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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    RaultTN
    RaultTNAuthor
    Prominent Collaborator I
    January 9, 2023

    Thanks @Ken_Griffiths  so far I am 15 minutes in and no cutout since changing those settings.  Mine now match what you shared above.  Fingers crossed.  

      RaultTN
      RaultTNAuthor
      Prominent Collaborator I
      January 9, 2023

      @Ken_Griffiths  @ThatOneDude  No dice on changing the Frame Rate or Dynamic Range.  Still cut out on me.  I also confirmed this TV (LG Model 65UM6900PUA) is a 10 bit (HDR10) tv so it should support it.

        

        Ken_Griffiths
        Ken_Griffiths
        January 9, 2023

        Yes, my LG TV model is 10 bit colour too.. 👍

        FWIW … On my LG  TV I just have ‘instant game response’ disabled on the HDMI-2 eARC port - I’ve left it ‘ON’ on the other ports. Exactly the same for HDMI deep colour too.

          ThatOneDude
          ThatOneDude
          Lyricist III
          January 9, 2023

          Im sorry to hear that @RaultTN on another note, I changed it back to DD+ and am an hour into Ratatouille (which supports Atmos) and its just as before, outputting DD+ 5.1 . So from my observations DD+ and DD Should work (except on Apple TV+ , DD only)

           

          RaultTN
          RaultTNAuthor
          Prominent Collaborator I
          January 9, 2023

          Ok so I have matched those setting @Ken_Griffiths ill let that ride and see how goes. Couple of other questions as I continue to dig. 
           

          What do you have under Aspect Ratio Setting?

          Is Just Scan on Auto, On, or Off?


          Another thought is this AV Sync Adjustment?  It was previously off but I can see when I enable that I can bypass?


          Lastly, to confirm that Bitstream is correct for each HDMI port for audio formatting?  

           

           

          RaultTN
          RaultTNAuthor
          Prominent Collaborator I
          January 9, 2023

          @ThatOneDude  How are you getting your DD+ to not play Atmos?  When I enable DD+ I am still showing an Atmos signal through the Sonos App?


           

           

          ThatOneDude
          ThatOneDude
          Lyricist III
          January 9, 2023

          Hmmmmmmm, let me see. I once had all my HDMI ports set to Bitstream but After the many headaches I had about a month ago trying to fiddle with Atmos on my TV I decided to just go back to PCM on my HDMI 1 (Fire Stick 4K port). Bitstream is what I read you need to have set if you want Atmos Content but it wasnt working for me so I just went back to PCM. Give it a shot. My Sonos Beam 2 is HDMI 2 btw. Ow and My Sound Out is Set to HDMI ARC (Pass-through)

           @RaultTN 

          Ken_Griffiths
          Ken_Griffiths
          January 9, 2023

          Bitstream is set on all my ports ..

          Aspect Ratio = 16:9

          Just Scan = Auto

          RaultTN
          RaultTNAuthor
          Prominent Collaborator I
          January 9, 2023

          @ThatOneDude This is interesting.  So I just changed HDMI 1 (firestick) to PCM and now when I view the Sonos App it is showing Dolby Digital Plus 5.1 as you showed earlier.  It will be interesting to see if it kicks out again since it is not actually pushing out Atmos.  I didnt think PCM would push that but maybe its because the sound is actually going through HDMI (ARC)?  I have no idea.  It’s also very strange considering @Ken_Griffiths  has Bitstream for all inputs and has not experienced any of this madness.  So I guess if I dont get kicked out, this wouldn't fix the actual Atmos content but it at least gets me to DD+.  I still dont understand how this works between HDMI1 (firestick) being PCM, and HDM2 (Beam ARC) being bitstream.  My brain hurts ha. 

          ThatOneDude
          ThatOneDude
          Lyricist III
          January 9, 2023

          I'm right there with ya bud 😅😂 feels kind of counterintuitive but atleast DD+ 5.1 will play when the content has it. I dont even remember how I came to this conclusion, probably countless google searches with some trial and error and a few shots of Bourbon to smooth out the torture hahaha. @RaultTN 

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