Been fighting with this issue and haven't found an answer, maybe one of you guys have a Doctorate in AVR. For some reason, I can't find the mental bandwidth to grasp AVRs and the billions of acronyms that go with it - to quote Cousin Eddie, "The sh*tters full".
I'm dealing with these components.
Yamaha RX-V681
AppleTV 4K
Sony UBP X700
Premium High Speed HDMI cables
Let's start with the AppleTV, I have HDR enabled on the Apple TV and the Yamaha on Mode 1. The Apple TV displays and plays back with no issues. Switch to the X700 and no picture.
Switch the Yamaha to Mode 2 and the X700 works, but the Apple TV reverts to SDR.
I've swapped cables back and forth. If a cable enables HDR on the AppleTV I presume it meets the 18Gbps requirement and would work without issue on the Sony. I also tried different 2.2 HDMI ports on the Yamaha and can't get both of these inputs to work without switching modes.
I don't want to keep switching 4K mode in advanced menu (Power down AVR, hold Straight and power button, scroll options, set, power down, power back up). Wife and kids can't tolerate anything beyond lifting a finger to get what they want within a millisecond. If the Harmony One doesn't do it I've got to stop whatever it is I'm doing to explain yet again...you get the picture, it's a PIA.
My main question is why won't the X700 work in Mode 1? This same problem occurs if I use an older Sony S590 player as well.
Here's the info from the Yamaha manual for HDMI modes: