SOLVED: HDMI passthrough, rear speakers do not work on 5.1

[klaarnou]

Hi there.

Im using the latest client.
It seems that it is a windows issue not a jellyfin issue because I also tested it on VLC and the same thing happens.
As I understand:
- Windows sends the encoded sound (passthrough) via HDMI to the TV.
- The TV sends it Via ARC to the sound bar

It looks like windows sends everything as Atmos (even 5.1). <--Not sure

I have installed the latest Atmos drivers and it seems to work now.

Thanks for your help.