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

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.

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

Posted on 2019-05-24 07:15:55 OLED TVs Vote Up0Vote Down
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!
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15 Comments

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

    SiranSiran Member
    Posted on 2019-05-24 17:53:09 edited May 25 Vote Up25Vote Down
    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.
    DiabolusExPapaMiraculidfa973Lightning0metalmachine
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    RE: OLED C9 - EDID / limitation regarding HDMI-eARC pass-through

    fenster3000fenster3000 Member
    Posted on 2019-05-24 22:21:48 Vote Up30Vote Down
    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.
    DiabolusExSiranPapaMiraculidfa973Lightning0metalmachine
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    RE: OLED C9 - EDID / limitation regarding HDMI-eARC pass-through

    jymigjymig Member
    Posted on 2019-05-25 06:44:24 Vote Up30Vote Down
    I hope that LG will implement it since now there is no major problem with the HDMI 2.1
    DiabolusExSiranPapaMiraculidfa973Lightning0metalmachine
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    RE: OLED C9 - EDID / limitation regarding HDMI-eARC pass-through

    PapaMiraculiPapaMiraculi Member
    Posted on 2019-05-25 15:04:29 Vote Up25Vote Down
    Seconded. Please fix!! 
    DiabolusExSirandfa973Lightning0metalmachine
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    RE: OLED C9 - EDID / limitation regarding HDMI-eARC pass-through

    DiabolusExDiabolusEx Member
    Posted on 2019-05-25 15:21:12 Vote Up25Vote Down
    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....  :/ 


    SiranPapaMiraculidfa973Lightning0metalmachine
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    RE: OLED C9 - EDID / limitation regarding HDMI-eARC pass-through

    HugoLiuHugoLiu Member
    Posted on 2019-05-25 18:19:11 Vote Up25Vote Down
    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.
    SiranPapaMiraculidfa973Lightning0metalmachine
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    RE: OLED C9 - EDID / limitation regarding HDMI-eARC pass-through

    peterjcatpeterjcat Member
    Posted on 2019-05-26 05:39:22 Vote Up25Vote Down
    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. 
    PapaMiraculiSirandfa973Lightning0metalmachine
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    RE: OLED C9 - EDID / limitation regarding HDMI-eARC pass-through

    JamalofLGJamalofLG LG Moderator
    Posted on 2019-05-27 23:09:41 Vote Up70Vote Down

    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.

    fenster3000HugoLiuSiranAvernarDiabolusExBaffPapaMiraculidfa973bertsylvsemlethe3rdand 4 others.

    Did this resolve your problem? Let everyone know by selecting "Helpful"!

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

    fenster3000fenster3000 Member
    Posted on 2019-05-28 00:11:08 Vote Up25Vote Down
    Thank you. 
    Looking forward to hearing from you again if you received an answer :)
    DiabolusExSirandfa973Lightning0metalmachine
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    RE: OLED C9 - EDID / limitation regarding HDMI-eARC pass-through

    UdoGUdoG Member
    Posted on 2019-05-28 04:22:47 Vote Up25Vote Down
    Thanks JamalofLG!
    DiabolusExSirandfa973Lightning0metalmachine
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    RE: OLED C9 - EDID / limitation regarding HDMI-eARC pass-through

    TomcupTomcup Member
    Posted on 2019-05-28 10:04:27 Vote Up30Vote Down
    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.  
    DiabolusExPapaMiraculiSirandfa973Lightning0metalmachine
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    RE: OLED C9 - EDID / limitation regarding HDMI-eARC pass-through

    AvernarAvernar Member
    Posted on 2019-05-28 14:51:27 Vote Up30Vote Down
    Thanks Jamal,
    This is a major limitation on the eARC feature and hopefully it will be corrected soon.
    DiabolusExPapaMiraculiSirandfa973Lightning0metalmachine
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    RE: OLED C9 - EDID / limitation regarding HDMI-eARC pass-through

    BaffBaff Member
    Posted on 2019-05-31 01:31:30 Vote Up30Vote Down
    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!
    PapaMiraculiSiranDiabolusExdfa973Lightning0metalmachine
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    RE: OLED C9 - EDID / limitation regarding HDMI-eARC pass-through

    theMuletheMule Member
    Posted on 2019-05-31 16:30:21 Vote Up25Vote Down
    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!
    DiabolusExSirandfa973Lightning0metalmachine
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    RE: OLED C9 - EDID / limitation regarding HDMI-eARC pass-through

    dfa973dfa973 Member
    Posted on 2019-06-03 06:30:04 Vote Up30Vote Down
    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!
    SiranDiabolusExjmpage2Lightning0metalmachineRussellH
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