Video card supported HDR.
Monitor supported HDR.
In Windows settings HDR On/Off are missing.
(I use Radeon R9 280x supported HDR video card (dxdiag) and Sony XD800 supported 4k and HDR, but Windows are missing key AdvancedColorSupported in param Monitor Advanced Color Capabilities in dxdiag log. I think trouble around this.)
Card name: AMD Radeon R9 200 Series
Chip type: AMD Radeon Graphics Processor (0x6798)
Device Key: Enum\PCI\VEN_1002&DEV_6798&SUBSYS_30011043&REV_00
Current Mode: 1920 x 1080 (32 bit) (60Hz)
HDR Support: Supported
Display Color Space: DXGI_COLOR_SPACE_RGB_FULL_G22_NONE_P709
Monitor Name: Generic PnP Monitor
Monitor Model: SONY TV *00
Monitor Id: SNYF903
Native Mode: 3840 x 2160(p) (60.000Hz)
Output Type: Displayport External
Monitor Advanced Color Capabilities: BT2020RGB BT2020YCC Eotf2084Supported
The issue start after buy new TV (Sony XD800) and update to "creaters update" on "win 10" which support hdr.
If stream 4k hdr content from from WMP to TV, all work is well.
Now use Win 10 - 10.0.16299 build 16299.
For troubleshooting I change resolution\color depth\video driver. On TV setup "enchanced mode" on hdmi.
I have now installed Windows 10 Pro 64-bit version 1709 Build 16299.125.
(DxDiag - Windows 10 Pro 64-bit (10.0, Build 16299) (16299.rs3_release.170928-1534))
Recomended video driver to my Radeon R9 280x on amd.com is Adrenalin Edition 17.12.2
I tried update and pure video drivers installed, but issue is not resolved.
Driver version in Device manager -> Display adapter is 23.20.15007.1005