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Home › OLED TVs

OLED C9 - EDID / limitation regarding HDMI-eARC pass-through

UdoGUdoG Member
May 2019 in OLED TVs
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I just want to tell that I discovered that the C9 has a limitation regarding HDMI-eARC pass-through, it seems that LG did not enable the AudioEDID for LPCM 8 channels, just the standard LPCM 2 channels. The LPCM 8 channels are very important for multi-channel audio from game consoles and PCs because not all games/content are using compressed HD audio (TrueHD+Atmos - this works just fine via eARC). The limitation is not in the hardware, because if you modify the AudioEDID of the LG HDMI-eARC port with an HDFury adapter the TV accepts the LPCM 8 channel audio and is passing the audio to the AVR, unmolested (as RTINGS did discover in their C9 review). Maybe LG can enable this AudioEDID in future firmware, greatly expanding the usefulness of the eARC feature with a minor modification. Thank you very much!
Tagged:
  • eARC
  • EDID
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  • LGModerator1LGModerator1
    October 22, 2019, 2:53 pm Accepted Answer

    Good Morning,

    LG will be introducing PCM Multi-channel support when using eARC in the 2 quarter of 2020. This will be possible via a software update for 2019 & 2020 TV that support eARC.  

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Answers

  • SiranSiran Member
    May 24, 2019, 5:53 pm edited May 2019
    I totally support this.

    Please add PCM Multichannel 5.1/7.1 audio support to the 2019 series OLEDs eARC via EDID update. I plan on connecting my Xbox One X directly to the LG in order to use VRR and right now I'd lose uncompressed PCM Multichannel audio for all my games and have to resort to lossy bitstream audio which also adds audio lag. Especially for a TV with so many gaming features (VRR, ALLM, 120Hz support) supporting uncompressed PCM Multichannel which is the standard audio format of most games is essential.

    I plan on buying a new TV set this year and adding this small convenience will certainly swing my favor towards the LG OLED. 

    Thank you.
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  • fenster3000fenster3000 Member
    May 24, 2019, 10:21 pm
    Yes. LG needs to add Multi-Channel LPCM support for eARC.
    It is a huge bummer for me that the C9 does not support this feature.
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  • jymigjymig Member
    May 25, 2019, 6:44 am
    I hope that LG will implement it since now there is no major problem with the HDMI 2.1
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  • PapaMiraculiPapaMiraculi Member
    May 25, 2019, 3:04 pm
    Seconded. Please fix!! 
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  • DiabolusExDiabolusEx Member
    May 25, 2019, 3:21 pm
    What? But Why? 

    I was planning to buy this tv.
    But I need LPCM 8 over eARC beause I want to connect my PC to it...

    Please fix this or I have to buy another TV....  :/ 


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  • HugoLiuHugoLiu Member
    May 25, 2019, 6:19 pm
    this is very important for PC gamers like me which multiple channel  PCM is the only way output audio, and intent to use TV as the central hub(for best input lag) then output audio to receiver by eARC, please implement this as this is the only thing that prevent me getting this TV, thanks.
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  • peterjcatpeterjcat Member
    May 26, 2019, 5:39 am
    Absolutely. Seems like a real waste for all the latest formats to be supported while multichannel PCM doesn’t work! It still has a lot of uses on PCs, consoles, Apple TVs etc etc. 
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  • LGModerator1LGModerator1 LG Moderator
    May 27, 2019, 11:09 pm

    Good Evening,

    I see your comments on the EDID limitations. I have escalated the issue over to our Engineering Dept. for review to see what can be done. I will provide an update once I get more information.

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  • fenster3000fenster3000 Member
    May 28, 2019, 12:11 am
    Thank you. 
    Looking forward to hearing from you again if you received an answer :)
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  • UdoGUdoG Member
    May 28, 2019, 4:22 am
    Thanks JamalofLG!
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  • TomcupTomcup Member
    May 28, 2019, 10:04 am
    Thanks Jamal, 
    I just want to second that this is also an issue on the 77"C9 - it also cannot pass PCM audio through eARC.  The PC and Xbox only recognize it as a 2 channel device.  
    The ability to pass uncompressed multi channel PCM sound through eARC is crucial for PC and console gaming. The TV does pass through Atmos and other sound codecs, but these introduce audio latency which is unacceptable for gaming.  
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  • AvernarAvernar Member
    May 28, 2019, 2:51 pm
    Thanks Jamal,
    This is a major limitation on the eARC feature and hopefully it will be corrected soon.
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  • BaffBaff Member
    May 31, 2019, 1:31 am
    Just adding my name to the list of people who would like to see PCM Multichannel EDID added.  Seems like it should be a simple fix. Thanks!
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  • theMuletheMule Member
    May 31, 2019, 4:30 pm
    I'm also waiting for this to be added to an otherwise great TV so I can input 5.1/7.1 PCM from a PC.  I almost didn't buy this TV because of this limitation and there are others on the fence.  The rtings review also points out this missing feature and adding it could help improve the score.  Thank you!
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  • dfa973dfa973 Member
    June 3, 2019, 6:30 am
    I just hope that LG can make this minor modification for the AudioEDID and unlock the full power of the HDMI 2.1 eARC feature. Come on LG, you were brave enough to deliver us a full HDMI 2.1 premium TV in 2019 when no other manufacturer did!
    Do what you need to do and add the 8 channels LPCM AudioEDID to the eARC pass-through! Thank you!
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  • lujanlujan Member
    June 7, 2019, 3:25 pm
    UdoG, I will be getting an 4K Fury adapter on Monday and was wondering what settings you used on the adapter when you connected it between the C9 and you AVR?
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  • GCTubaGCTuba Member
    June 7, 2019, 4:30 pm
    I am very interested in this as well as I will be connecting my PC direct to the TV using eARC to an Onkyo TX-RZ830. I will also be buying an HDMI 2.1 GPU when those become available.
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  • gorman42gorman42 Member
    June 8, 2019, 9:54 am
    I wholeheartedly support the request to implement proper multichannel PCM support for eARC. There's many scenarios where this is useful/needed. I hope LG will support the full eARC implementation.
    Thank you.
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  • UdoGUdoG Member
    June 11, 2019, 7:19 pm
    lujan
    Sorry, I sold my 4K Fury - with the hope, that LG will fix this soon.
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  • AbidingTechDudeAbidingTechDude Member
    June 12, 2019, 8:09 pm
    Throwing my hat into the ring on this limitation as well, multichannel LPCM support would be greatly appreciated for Xbox One X and Nintendo Switch gaming. (found out to my dismay last night that I had to run my Switch through my AV receiver for surround sound)
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  • ElektroDragonElektroDragon Member
    June 12, 2019, 11:43 pm
    I  just spent over $6k on the 77 C9, so I hope LG can resolve this quickly with firmware and allow all multichannel uncompressed LPCM signals to be passed via eARC without any HDMI CEC interference. Thank you!
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  • radamoradamo Member
    June 13, 2019, 7:09 pm
    Multichannel LPCM would be REALLY helpful...

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  • UdoGUdoG Member
    June 14, 2019, 4:28 am
    @JamalofLG

    Any feedback from your Engineering Department?

    Please keep us informed.

    Thanks!

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  • StickybeakStickybeak Member
    June 14, 2019, 5:42 am
    I'm also extremely interested in this fix.

    On a related note, does anybody know if one can use Custom Resolution Utility to achieve the same EDID spoofing as the HD Fury? I've seen it mentioned elsewhere, but so far failed to get multichannel LPCM eARC passthrough working.
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  • peterjcatpeterjcat Member
    June 14, 2019, 9:32 pm
    I've tried CRU to spoof the EDID, the result is that Windows thinks there are 7.1 channels and tries to send audio to all of them, but the AVR still only sees the FL and FR channels and sound only comes through those channels.

    I am not sure whether the HD Fury actually fixes the multichannel LPCM issue, as the people who have used it (including rtings.com) appear to have had slightly different issues and achieved different outcomes. Not sure if @UdoG can confirm whether they got multichannel LPCM working via eARC before returning their HD Fury?
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  • StickybeakStickybeak Member
    June 15, 2019, 3:43 am
    Ah, that's consistent with my results.
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  • LGModerator1LGModerator1 LG Moderator
    June 17, 2019, 3:28 pm
    No update yet. Still awaiting a response. I will follow up with you once I get more information.
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  • xcimoxcimo Member
    June 19, 2019, 2:22 am
    Add me to the list of people looking for improvements on the eARC side. Bought a 65in C9 over a C8 for eARC support. 

    Right now the TV with apps (Emby/Plex) will passthrough Atmos with Dolby surround but not Atmos with TrueHD.

    Thanks @JamalofLG it's good to see LG engage with its customers.
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  • peterjcatpeterjcat Member
    June 20, 2019, 10:04 am
    This is a good point, it would be great if the internal TV apps would take advantage of eARC. At the moment I can’t play any HD audio even from USB. 
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  • radamoradamo Member
    June 20, 2019, 12:45 pm
    Would love to see a better (more complete) implementation of eArc.
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