No Displayport audio with GTX1070, Ubuntu 16.04, Linux 4.8.0-45, Driver version 378.13

I have a following setup

  • GTX1070, Ubuntu 16.04, Linux 4.8.0-45, Driver version 378.13

Problem is that there is no audio via displayport. My 1070 is connected with displayport to Dell U2715H.

All audio devices (HDMI/Displayport) are listed as unplugged in sound panel and also in PulseAudio Volume control. Obviously dispayport is connected since I can see my desktop.

Any guidance how to make the setup work?

I have mostly the same problem.

GTX 1070, Ubuntu 18.04. Connected via mDP.

Audio devices (hdmi/displayport) listed as unplugged in PulseAudio.

https://devtalk.nvidia.com/default/topic/913322/linux/sound-over-displayport-sst-mst-/post/5098719/#5098719
A workaround would be to switch the monitor to DP 1.1 instead of DP 1.2 if possible and useable.

I switched the mDP input of my Dell UltraSharp U2715H to DP 1.1 and sound now works. Thank you very much generix.