Hi y'all, it looks like a lot of great info is being shared on this thread; hoping that this question is helpful for others as well.
Just tried hooking up the Series X to the V6A and my TV (Samsung QN65Q6FNAF) this morning, but wasn't able to get 4K working. I removed the V6A from the equation (i.e., Xbox connected directly to the TV) and that allowed me to get 4K coming out of the Series X. This leads me to believe I haven't found the right settings with the V6A and the TV. Anyone else running into something similar? I remember having to do some finagling to get the Nintendo Switch to work.
Thanks in advance!
Edit: Should add, Series X is connected to V6A with cable that comes in the box; V6A is connected to the TV with an HDMI cable I already had. 4K worked when Series X was connected directly to TV with this cable I already had.
I was having issues with series x when using arc HDMI port on TV. By this I mean I was only using that port not actual arc feature.
Direct to tv on that port with series x worked. Through receiver first then to arc port on tv, it'd be full black screen or even flicker on for half second bursts then black out again. It was basically failing to hold stable sync. Again, ARC wasn't even on, disbled on tv and receiver even. I tried enabling it to see if it'd solve it didn't. That port works fine with every other device hooked up to yamaha. However for sake of testing I connected receiver to another HDMI port that was full bandwidth but NOT arc, suddenly series x worked fine. Can't really explain this, just know that it worked. TV I am using is a Sony 800F so it's not HDMI 2.1, just 2.0b full bandwidth on ports 2 and 3 with one being arc and one not being arc.
You'll still get HDR banding going through yamaha regardless of port sadly. Happens with series x, (if you enable YUV422, my tip if going through receiver, don't) happens with PS4 pro, happens with my apple tv. My take on HDR banding is yamaha has a serious problem handling YUV422. It actually doesn't HDR band when using YUV420 on series x (which is default, YUV422 is not enabled). Unfortunately PS4 doesn't let you choose color mode. It's automatic and forced. It will use YUV422 if there is bandwidth for it, it only uses 420 on slower HDMI ports.
To others in thread that can't reproduce banding, it's probably because device you are testing is outputing 420 or 444 (which is possible even with HDR content if frame rate matching is enabled, because sub 60hz content doesn't need to color crush for bandwidth).