Had the same problem to start with. Bought this year's Samsung 65" 4k TV. Then I got Stadia. No 4k, no HDR. Checking it out, I totally forgot it was still using HDMI 1.4 cable. Installed 2.1 8k cab...
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Had the same problem to start with. Bought this year's Samsung 65" 4k TV. Then I got Stadia. No 4k, no HDR. Checking it out, I totally forgot it was still using HDMI 1.4 cable. Installed 2.1 8k cable for overkill - still nothing. Well, my Denon was about 8 years old so was thinking about upgrading anyway, and bought a new Denon. Set it up & tried again. Yep, 4k was there but, no HDR. Set the Denon to Pure Direct for the CC port and, bingo! HDR available. OMG! What a difference. Looks absolutely gorgeous. No sign of 5.1 setting anywhere but, it's definitely outputting it. Well happy now. Oh and yes, both TV and Denon have eARC.