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I see from his earlier messages that he does mention the ASRock AB350.




I found I get the dimness on my (modern, but cheap) 4K-HDR Philips, -if- I use the following options:


8bit 4:4:4

8bit 4:2:2

12-bit 4:2:0


However if I use 4:2:0 at either 8 or 10-bit the colour returns to normal. I am guessing that is because my TV is probably an 8bit-with-10-bit-extensions or something like that. I.e. not fully HDR-spec as I also see other cheaper HDR-ready TVs are really only 8-bit colour also.