I have a pretty cheap TV which has a setting for “Open HDR” (Auto, Low, Medium, High). From what I understand, Open HDR = HDR10. If this feature is active, the TV will show “HDR” in its onscreen info panel.
This mode is not automatically detected or switched to when playing 10bit etc. video content in CoreELEC. If in CoreELEC system settings switch “Map SDRto HDR” is activated, the TV will switch to HDR mode and video content is accurately reproduced as 10bit HDR (HDR info is shown in TV info panel).
So, is there any way Open HDR could be activated automatically by CoreELEC? I’m afraid, though, the TV panel doesn’t inform properly of its capabilites. Here’s a debug log: http://ix.io/4Aim