Any Receivers have proper colorspace support?
I've had an Onkyo receiver since mid 2012, and it's started to crap out on me so I need to replace it. Up until now I've run my video card split, with one HDMI going directly to my 4K TV, and one HDMI going to the receiver so I can have 7.1 audio and still have 4K HDR display. I would LIKE to just run one cable to receiver and use 4K passthrough.
This past weekend I picked up an Onkyo TX-NR797, and when I plug into it Windows tells me that it can only do 8bpc, YCbCr 4:2:0. This is, weirdly, WORSE than the old HT-R591 I've been using, which had full RGB 4:4:4 support. So I can't turn on HDR in Windows display settings (I can click the button to turn it on, but it will immediately turn back off again), which means there are games I can't run in HDR. I can go back to the dual HDMI set-up, but this is less than ideal, especially as (for reasons I haven't been able to figure out, maybe just a bad DP->HDMI adapter) my PC has issues re-acquiring the receiver when I turn it off and on again, or use it to watch TV and then switch back to the PC (this isn't receiver specific).
So I'm leaning towards returning this one and getting something else, but I don't know which (if any) receivers will actually have the correct available colorspaces when plugged into a PC, and I don't want to be running back and forth exchanging receivers until I find one that works, and it's not like PC Display Color Specs are listed anywhere, and I don't have a laptop I can bring to the store to hook up and check.
I'm leaning towards a Denon (either the AVRS950h or the AVRX3600H for future-proofing). Do either of these have what I'm looking for? And if not can anyone recommend one that does? I need 4K, all the HDRs, and all the good sound things that seem like they're pretty standard now.