[JGrana01]

Happy to test other Kodi betas and/or DV testfiles

Could you test with one of the Kodi builds from this thread that have been especially created to play Dolby Vision MKVs:

https://ufile.io/76xbe039
http://mirrors.kodi.tv/test-builds/andro...64-v8a.apk

The first one can be installed separately, the second one will overwrite your current Kodi version.

MKV test files with various profiles are here:

https://www.makemkv.com/download/dvtest/

Note that the files will not always play correctly and seem to hang Kodi. In that case you can get them to work by disabling and enabling Dolby Vision in the Shield's Display Settings.

Ok, I have done some testing. Since my Sony only supports LLDV, by now we know there is no DV Metadate passed from the Shield to the display during playback...
But, I was able to test the collection of files and have some observations:

I installed the first build (https://ufile.io/76xbe039) and also downloaded the 5 .mkf files.
Also, Kodi is setup with       Settings->System->Display  Resolution 3840x2160p, Refresh Rate 59.94, Delay after change of refresh rate 1 second, all but the 50hz rates/resolutions Whitelisted.
Settings->Player->Videos    Adjust display refresh rate - on start/stop, Sync playback to display disabled.
Video files are stored on a NAS box, using nfs mounts.

After starting Kodi, the Diva shows:
4K59.930 422 BT709 12b 593MHz 2.2

First, with one exception, all but one of the videos had trouble displaying depending on a variety of things. From cold start (turn of system, turn back on, reboot Shield) usually P4_LG_Dolby_Trailer_4K_Demo  and P5_Dolby_Amaze had the most problems. Sometimes they would display fine, sometimes they would display but colors way off, sometimes they would hang and cause Kodi to crash. Actually, P5_Dolby_Amaze almost never played (and crashed) if that was the first video I attempted to play after startup.

When they did play, even when colors (I assume color space confusion), Diva reports
P4_LG_Dolby_Trailer_4K_Demo - 4K23.972 422 BT2020 12b LLDV 297MHz 2.2
P5_Dolby_Amaze - 4K60 422 BT2020 12b LLDV 594MHz 2.2

Looks pretty normal/expected.

P5_Dolby_Amaze had the most problems - it would often hang at the 12 second mark - then shortly after, crash Kodi.

The P7 files seemed to play better.
P7_FEL_GIJoe_The_Rise_of_Cobra - 4K23.972 422 BT2020 12b LLDV 297MHz 2.2
P7_MEL_GIJoe_The_Rise_of_Cobra - 4K23.972 422 BT2020 12b LLDV 297MHz 2.2

Finally, P81_GlassBlowing2_3840x2160@59_94fps_15200kbps. The shining star.
P81_GlassBlowing2_3840x2160@59_94fps_15200kbps - 4K59.930 422 BT2020 12b LLDV 593MHz 2.2

I discovered that if after starting Kodi, I played P81 first, the rest had a very high success rate of playing afterwards.
If, in the other hand, I played P4, P5 or P7, I had a 50/50 chance of the video starting.

Observations:
1) I did stop/resume on all the videos. P81 always was able to resume fine. The others, sometimes yes, sometimes crash.
2) During testing, at some point, the colors would go way off. Lots of magenta and blown out whites, etc. This typically would occur in stopping a video then resuming. I did not try to extend my refresh rate change time to more than 1 second.
3) At times, stopping a video then attempting to resume resulted in losing nfs connectivity to the NAS box. Especially with P5_Dolby_Amaze. A restart of Kodi was required to get it back.
4) When the colors did go way off, Diva continued to report BT2020 being sent. Once the colors go off, all DV is off. Even after quitting Kodi. Even Netflix. Even HDR10 files play with off colors.
As you said, toggling DV off and on in the Shield settings likely does an HDMI Hot Plug event - so the TV is the on confused. Post hot plug, everyone is back on the same color space page ;-) Diva allows me to send a Hot Plug Event - this also go colors back.

My $0.02
Let me know if you have any questions.