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Bug in HDMI 2.1 chips Affect AV Receivers, XBOX Series X & NVIDIA Graphic Cards

by October 24, 2020
HDMI 2.1 Bug

HDMI 2.1 Bug

Yesterday a German audio website discovered a bug in the latest HDMI 2.1 chipsets sourced by Panasonic and utilized in the new Denon, Marantz and Yamaha HDMI 2.1 AV receivers. This bug can inhibit pass through of 4k/120Hz HDR and 8k/60 HDR for some devices like NVIDIA's newest graphics cards and the latest XBOX Series X gaming console. When engaging these resolutions with these source devices directly connected to an HDMI 2.1 capable receiver utilizing the Panasonic HDMI 2.1 chipset, the user can experience  a blank screen. This is a potential problem for any other manufacturer planning on using this HDMI 2.1 chipset in their next generation of HDMI 2.1 AV receivers as well. We inquired with Sound United and Yamaha to see what their solutions would be to resolve this problem to determine if a hardware or firmware fix would be needed.

 Official Sound United Response Regarding the HDMI 2.1 Chipset Bug

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.

  Official Yamaha Response Regarding the HDMI 2.1 Chipset Bug

As we test and explore new gaming system capabilities and the latest HDMI specifications, we will provide guidance on our website to help new and future customers with the compatibility of our latest AV receivers. We will certainly provide you with an update in the near-term.

Audioholics will continue to follow this issue and report back once new information is received on the permanent solution from manufacturers deploying the Panasonic HDMI 2.1 chipset in their AV receivers. Share your experiences with any HDMI 2.1 issues when connecting up an XBOX Series X or latest NVIDIA graphics card in the related forum thread below.

About the author:

Gene manages this organization, establishes relations with manufacturers and keeps Audioholics a well oiled machine. His goal is to educate about home theater and develop more standards in the industry to eliminate consumer confusion clouded by industry snake oil.

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Recent Forum Posts:

Irvrobinson posts on November 16, 2020 14:17
snakeeyes, post: 1434052, member: 85468
Guessing when the cost of 10G switches comes down, they will do this over IP using ethernet switching instead of HDMI.

I doubt it. Not if HDMI is 48Gbps. Thunderbolt is more likely (it's moving to 40Gbps) than Ethernet, but I still doubt it. HDMI has HDCP (digital rights management capabilities), which the content providers demand.
Otto Pylot posts on November 16, 2020 14:10
That all sounds good but I fear we are stuck with HDMI for a very long time.
Trell posts on November 16, 2020 12:51
snakeeyes, post: 1434052, member: 85468
Guessing when the cost of 10G switches comes down, they will do this over IP using ethernet switching instead of HDMI.

Not only cost but power consumption as well.
snakeeyes posts on November 16, 2020 12:34
Guessing when the cost of 10G switches comes down, they will do this over IP using ethernet switching instead of HDMI.
Otto Pylot posts on November 11, 2020 14:25
Trebdp83, post: 1432730, member: 43634
Yeah, and the HDMI 2.1 spec accounts for 48gbps but nobody has hardware at that spec. Cables coming soon.
https://hdmi.org/spec21sub/ultrahighspeedcable
Zeskit and Belkin are supposed to have UHS HDMI cables and are already selling them, even though they don't have the QR label of authenticity affixed to the packaging yet. That is supposed to happen around the end of November/early December. Those cables will be certified for 48Gbps but it's going to be a long time before source material is available that requires that bandwidth. HDMI 2.1 is really only useful for the gamers at present.
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