The test I'm suggesting required your unplug from the mains. The trickle power will keep state in the monitor and pc that can break hdr. Why do I say this? Because I proved to Dell that one of their monitors had bad firmware that only once triggered in the bad mode would only reset on a cold power up. When I get a moment o investigate I will have a look at EDID and see if there is where the HDR info if returned from the monitor. I have not looked at that level of details yet, so things to learn about. Barry |
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