I fixed this! There's a setting in the Google TV menu (not the TV's display settings menu) that enables HDR on the HDMI inputs. It only worked for HDMI Inputs 2 and 3 for me.
I have this same issue. Sony XBR-43X800E with chromecast ultra - The TV supports HDR 10 and HLG. I'm able to stream HDR content via Netflix without a problem. For some reason, Stadia says "HDR is no...
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I have this same issue. Sony XBR-43X800E with chromecast ultra - The TV supports HDR 10 and HLG. I'm able to stream HDR content via Netflix without a problem. For some reason, Stadia says "HDR is not supported by this device."