NO AUDIO over DISPLAYPORT ON UBUNTU 19.10 AND NVIDIA QUADRO M1200

Hi,

So I have a HP ZBook Studio G4 connected to a HP Thunderbolt 3 Dock. To this dock I have a LG Ultra Wide display connected via displayport.

Everything works fine, etc. BUT… there is no audio output from the external display. It doesn’t even show up in Settings>Sound>Output. On Windows this worked fine (via NVidia). I’ve tried a lot of solution but none worked so far.

Graphics Card: NVIDIA QUADRO M1200 MOBILE

DRIVER: nvidia-driver-435 (proprierary, tested)

Doesn’t work:
https://devtalk.nvidia.com/default/topic/1019761/linux/no-sound-using-displayport-audio-with-375-82-384-59-and-384-69/post/5237475/#5237475