Maybe I should turn Dolby Vision OFF?
I found this in another forum, I don't know if I can post it. If it's forbidden I will edit the post:
(credit to scrowe)
1. I think the UB9000 Netflix App is buggy on the current firmware. Whilst the Amazon App (Jack Ryan) always shows HDR 5.1 and plays in HDR2020/DD+, the Netflix App (Luke Cage S2/Altered Carbon) keeps flipping between displaying HDR 5.1 and UltraHD4K. In HDR I get HDR2020/DD+ in UltraHD4K I get REC709/DD+ output. At one point I could play Amazon HDR, and revert to Netflix and the Netflix app would switch back into HDR mode. As of yesterday Netflix is stuck in UltraHD4K. I have tried a factory reset, albeit I think this ended up creating the scenario where it was stuck in UltraHD4K support, rather than being able to revert with the trick above. Additionally if you set the AV in the Player to 1080P, the Netflix App reverts to HD 5.1 only on the respective content. This was also the behaviour on my UB900 previously.
2. But when I look at my AppleTV which I bought as stopgap, the Netflix UI also displays just UltraHD4K in same content, but outputs HDR2020/Atmos. When I look at my XBOX One the Netflix App shows HDR/Atmos and plays accordingly, albeit an issue with the Xbox is it now sends all audio for everything as Atmos irrespective if it is native, after the last update. So there is no consistency in my experience between how the Netflix Apps across devices are showing relative support for different AV formats. I don't have DV anywhere (apart from the UB9000 and AppleTV) though it seems Netflix displays the Dolby Vision logo on the content UI if it is able to playback DV.
3. So I think we can conclude that at least on the UB9000 the Netflix app is auto-detecting what it can deliver based on what it is connected to. Certainly some of this must be based on the EDID of the connected device via its HDMI connection. Therefore even if no official support for Atmos is supposed to be there, the app is detecting something in certain video chains where it thinks it can support it, and does so.
4. I guess another relevant question for this range of players, is whether they are supposed to be officially supporting Dolby Vision itself via the Netflix App, as this no doubt is a licensing area as well, albeit the players themselves are DV and DA licensed generally.