Tuesday, October 27th 2020
A German website, Heise.de, has discovered a bug in HDMI 2.1 chipset that causes black screen issues on specific hardware. On AV chipsets sourced by Panasonic, and used by Denon, Marantz, and Yamaha HDMI 2.1 AV receivers, the chipset experiences a specific issue of a black screen. More specifically, the bug happens once you connect Microsoft's newest console, Xbox Series X, or NVIDIA's Ampere graphics cards. When connecting these sources at resolutions like 4K/120 Hz HDR and 8K/60 Hz HDR to Panasonic HDMI 2.1 chipsets, the black screen happens. This represents a major problem for every manufacturer planning to use the Panasonic HDMI 2.1 chipset in its AV receivers, meaning that the issue has to be addressed. The Audioholics website has reached out to Sound United and Yamaha to see what their responses were, and you can check them out below.Sources: Audioholics, Heise.de
Official Sound United Response Regarding the HDMI 2.1 Chipset BugSome 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 BugAs 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.