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Discussion Starter #1 (Edited)
The quick rundown: 2020 AVRs with HDMI 2.1 Panasonic chips seem to display a black screen when pushing 4k/120 and 8k/60 through them. This is a hardware problem, so no firmware updates will fix it. Marantz, Denon, Yamaha use the chips in their 2020 and upcoming 2021 lineups. Sony, Pioneer and Onkyo have been said to have purchased those chips for use in their upcoming units. New Panasonic HDMI 2.1 chips are said to be in the works, with a rumored mid 2021 release.

It looks like workarounds will need to be done for certain transmission types. Bypassing the AVR in the middle and using eARC might be the only work around for now.

This is a rough translation from a foreign site, so hang in there on the read through. Just wanted to post this so that people know what's going on, are informed and we could discuss here.

Reddit discussion:
https://www.reddit.com/r/hometheater/comments/jgjzsb
Update 1:
 

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Lets see how long it takes Sound United or Yamaha to release some sort of explanation. Sounds like your lucky if eARC even works.
 

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My Denon x3700h is on order... if I don’t game will I be ok with this? 4K 60 HDR still works right?
 

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Discussion Starter #4 (Edited)
My Denon x3700h is on order... if I don’t game will I be ok with this? 4K 60 HDR still works right?
Yes. The only thing that was effected was 4k/120 and 8k/60. The only source devices that were tested was the nvidia GTX3000 series and the unreleased Xbox Series X. If you do not game, the chances of you hitting those numbers are slim. Nothing video only really requires that right now.
 

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Official response from Sound United:

Title: AVR 4K/120 Compatibility Issue with Certain Sources

Content:

Some new gaming source devices that support 4K/120Hz output may not work fully with Denon (or Marantz) 8K AVRs. You may discover this incompatibility issue due to a HDMI chipset mismatch between the devices. When the affected system is connected to the AVR via 8K HDMI input and set to output at 4K/120Hz, and the AVR’s 4K Signal Format option is set to “8K Enhanced,” you may not see the system’s source video on their display, and may not hear the system’s source audio processed through the AVR. This problem is only present when a display that supports 4K/120Hz is used.

We are currently investigating the issue further and will offer a permanent solution at a later date. Meanwhile, we would like to provide a couple workarounds to prevent the issue in its current state:


  • You can connect the system to the display directly via HDMI and use the display’s ARC/eARC functionality to feed the native audio back to the AVR using the connected HDMI cable between the AVR and display. This will allow users to decode the native audio format sent from the source. With this method, the display’s CEC/ARC option must be enabled as well as the AVR’s HDMI Control and/or the AVR’s ARC option. In the AVR, this option is located within the GUI under “Video – HDMI Setup.”
  • Another workaround is to leave or change the source’s video output to 4K/60Hz instead of 4K/120Hz until a permanent solution is available. This will ensure reliable communication between the source, the AVR and the display. The source’s default is set to output at 4K/60Hz, so if no change was initiated out of the box, then nothing further needs to be done.
We apologize for this inconvenience and we are currently working tirelessly to release a permanent solution so you can enjoy the 4K/120Hz experience using the latest sources with your AVR. We will have an update soon regarding the timeline of a permanent solution. We appreciate your patience.
 

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Official response from Sound United:

Title: AVR 4K/120 Compatibility Issue with Certain Sources

Content:

Some new gaming source devices that support 4K/120Hz output may not work fully with Denon (or Marantz) 8K AVRs. You may discover this incompatibility issue due to a HDMI chipset mismatch between the devices. When the affected system is connected to the AVR via 8K HDMI input and set to output at 4K/120Hz, and the AVR’s 4K Signal Format option is set to “8K Enhanced,” you may not see the system’s source video on their display, and may not hear the system’s source audio processed through the AVR. This problem is only present when a display that supports 4K/120Hz is used.

We are currently investigating the issue further and will offer a permanent solution at a later date. Meanwhile, we would like to provide a couple workarounds to prevent the issue in its current state:


  • You can connect the system to the display directly via HDMI and use the display’s ARC/eARC functionality to feed the native audio back to the AVR using the connected HDMI cable between the AVR and display. This will allow users to decode the native audio format sent from the source. With this method, the display’s CEC/ARC option must be enabled as well as the AVR’s HDMI Control and/or the AVR’s ARC option. In the AVR, this option is located within the GUI under “Video – HDMI Setup.”
  • Another workaround is to leave or change the source’s video output to 4K/60Hz instead of 4K/120Hz until a permanent solution is available. This will ensure reliable communication between the source, the AVR and the display. The source’s default is set to output at 4K/60Hz, so if no change was initiated out of the box, then nothing further needs to be done.
We apologize for this inconvenience and we are currently working tirelessly to release a permanent solution so you can enjoy the 4K/120Hz experience using the latest sources with your AVR. We will have an update soon regarding the timeline of a permanent solution. We appreciate your patience.
 

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They definitely point the finger at the source. But also say that THEY are working on a solution. Hmmm

Also says they WILL have a solution.
 

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Perhaps their "permanent" solution is to hope this blows over & get owners to upgrade to their 2021 AVRs with revised 2.1 FRL implementation :D
Denon isn't the greatest company in the world, but they are far from the worst.

They have already issued a fairly lengthy response (compare it to Yamaha), and they did it on a weekend! I fully expect them to put at least a reasonable amount of effort into fixing this issue. I expect we will hear more from Denon and Yamaha (and the other companies with HDMI 2.1 products coming soon) about this issue in the next couple weeks. Remaining silent on this will kill their holiday sales.
 
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They definitely point the finger at the source. But also say that THEY are working on a solution. Hmmm

Also says they WILL have a solution.
There is currently only one HDMI 2.1 source available to the public and another available to the media. And neither one works. So blaming the source is not really gonna work here. Its not like we have any other choice.
 

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I wonder if thy will put the 2021 models since they are going to use the same chipset? Or will they just release them anyway and hope to catch consumers who aren't internet savy.
 

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Hopefully they'll replace the HDMI boards with a chip that is tested to actually work once another chip is found. As always with early adopters, we play with fire hoping everything will actually work to the specifications.

Reminds me of back when Onkyo had an HDMI board/network chip issue that required replacement...
 
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