[markm75]

I have a samsung q6f series tv + denon x4300h avr and the htpc nvidia box with 1080 gtx card on hdmi.. i have the hdmi going through the receiver then out to the tv..

I cant get the tv to kick into hdr mode when using kodi/ds player and setting it to passthrough (which has rather crushed blacks when enabled too).. the samsung is a 10bit panel.. but from seeing this thread i guess RGB 8bit and FULL is the normal setting here correct?

 Doing a quick google search resulted in this webpage for your AVR.   https://denon-uk.custhelp.com/app/answer...ot-working   check if following those steps enables it.  (plus a quick test, bypassing that AVR and see if it kicks your tv into hdr mode.   

I got it working by setting kodi.. player.. dsplayer.. video decoder.. D3D11 Automatic (Native) hardware decoding.. once i did this its golden.. although the menu in pause, the colors are super saturated, orange lettering instead of yellow, probably expected.

The other issue.. despite telling dsplayer to not decode regular hd titles.. seems its taking over for normal movies not just uhd, the issue is that the lav audio decoder for dts-hd is not working.. my receiver flashes dts-hd and no sound is heard.. i've tried everything to get around this.. if i turn off dts-hd in the audio decoder section of dsplayer, i get stereo, this is how i isolated it to there at least. 

If i do the right click on a title and do play using.. video player.. all works.

It sounds like i need to configure video player merits for dsplayer to only play uhd titles somehow