[fandangos]

AFAIK, Shield only supports single layer DV profiles, that is profile 5  and 8. So it seems like getting it to play DV 7 at the moment is moot.

But then how come that the profile 7 MKVs trigger DV on our TVs and seem to have the correct colors? Or are you saying that this is some kind of "fake" DV where we are actually looking at HDR10 video without the DV metadata?

Because not all TVs handle Dolby Vision equally.

There are 2 kind of Dolby Vision.
Dolby Vision low latency and Dolby Vision.

In OPPO 203 this is called Dolby Vision Player Led (where the player does the processing) and Dolby Vision TV Led (where the TV does the processing).

The Shield supports both.

Green/purple colors are a symptom of player led DV into a TV led DV.

And what I think is happening is that this can be profile dependent.
Example:
TV can support Dolby Vision profile X as tv led but won't support profile Y.

Vicent Theo (hdtv test) has a nice video showing both formats.

I have a video showing that the Sony 900E that don't support Dolby Vision actually has this feature blocked and do support it if you spoof the EDID. But only as player led. If you do, tv led, it's purple/green screen.

I believe that's the reason why this is setup dependent.