[Warner306]

Well I kind of have it working. If I turn off hdr in Windows, when I boot back up Windows turns hdr back on. Nightmare.

If hdr is on in Windows, I can get a 1080p24 movie playing but it is has hdr on the resolution information. Colours are correct though. 2160p24 hdr is displayed correctly.

If I turn hdr off in windows. The 1080p24 picture is correct with no hdr. But the 2160p24 picture which states it is hdr is not actually displaying hdr.

Can you take a screenshot of the OSD (Ctrl + J) with Windows OS HDR turned off while playing an HDR video? It should state what is being played and whether that file has the correct hdr metadata.