Ubuntu: NVIDIA High Definition Audio not detected



Question:

What do I need to do to get sound over the HDMI/Displayport? I have two Thinkpad T420 both were running windows 8 and 10 and both work find no hardware issues. I put a load of Ubuntu 16.04 and then 16.10 on one of them. I've used the display port and the DVI port with a DVI to HDMI cable. The system settings, Sound doesn't show any NVIDIA NVS-4200M High Definition Audio. It only shows the analog sound It work in windows 10 fine.


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