[docwra]

HDR is not supported in Linux yet.

 Spook, is that your build below?  How is it working?  That is similar to what i have except the NUC I have a NUC6i5SYH.  I do not know much about its capabilities as I am new to all this.  It currently has Libreelec clean with kodi.  I have my plex server in network and I am sharing from a couple of other sources.  I get jittery video when i try to watch from outside the network anything 4k. I can wait for a magic box but i am not sure if one is coming.  Thoughts? 

Did you try this?

At first I got stuttering on panning scenes but a quick look in settings >> Player settings >> Videos >> Enable 'Sync Playback to display' fixed it!