It's really odd that you're experiencing these issues as you are. I'm using Minixs' stock Marshmallow (FW008) on my U9-H & my Sony AVR handles audio passthrough from Kodi absolutely perfectly. It is now truly decoding Atmos & DTS:X after I added my height speakers although I had to ensure certain settings in my AVR were correct as well. There is the possibility that the U9-H & Kodi are working as intended & it's actually our specific AVR's that could be playing a large part with this issue!!??!!??!! (Unfortunately, AVR's aren't exactly cheap so it's not like you can grab a spare & see if it all works with another make/model lol .)
However, my AVR essentially isn't even being recognised by Windows on my Neo N42C-4 at the moment. (Does Windows see your AVR correctly for example?). Kodi won't passthrough Atmos on that device & it's defaulting down to TrueHD 7.1!! (Windows sees my TV as the audio device instead of the AVR & oddly ignores the AVR even being there altogether.). It's a real head scratcher but the AVR itself is definitely a factor!!! (Sorry to go off topic, but it seems to be relevant.)
In Kodi on the U9-H (obviously) I enable passthrough for ALL available audio streams; otherwise:-
Output config - best match
Keep audio device alive - 2 minutes
Send low volume noise - enabled
Stereo upmix - disabled
Maintain original volume on downmix - disabled.
I've arbitrarily set the number of channels to 7.1 but it isn't used as all audio is being passed through normally & my set up is actually 5.1.2.
I suppose one way you could test it is if you have friend/family that has a different AVR to you?? Hook your U9-H up to their AVR/TV & see if the audio starts to correctly passthrough or behaves differently.
What settings are you using in the Minix audio settings as well?
on corelec its work without problem.
so i think android (fw008 our fw007) don't recognised my AVR Onkyo.
i tried all different settings but without success
on the first version that come with the box when i buy it (i think fw005 our fw006 and kodi17.3 )
i have true hd en dts hd in the options but i didn't work (no audio)
i don't think i now someone with a modern avr with true hd but i can try,
but i don't replace my avr for minix maybe replace minix in the future...
but so far its works great with coreelec and easy to switch to android for other apps than kodi.
and maybe it will fixed with updates (lets hope so)
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