* Ubuntu 16.04
* Computer is an Acer Revo One, RL85.
* Monitor is a Philips 271P4Q

This computer came with Windows but had Ubuntu installed over Windows, as a new install.

The Acer has one HDMI port and one "headphone" port. Not a speaker port, but "headphones". There is no "Mic'" input. Although I have never plugged a headphone [I actually don't have one....] in I have my speakers running through this. I also suspect this is a "two way port", in and output, i.e., speakers and Microphone through the same headset port.

The HDMI is running the Monitor.
Even with the speakers plugged in / working, I can switch to Monitor / HDMI sound output, which works fine.

I can not get either the camera nor microphone working on the Philips monitor.

In "settings" there is only one input : Analogue Input, Built in Audio.
I have no option for "HDMI Input", or similar.

In short, can I / how do I make the HDMI Microphone / camera work, or, is this a hardware limitation because I am running on a "mini pc" and the hardware won't do it? Will I need to buy a headset / mic' and separate camera?

As an aside, the Acer runs Ubuntu perfectly, all my other peripherals work and I have no issues. I suspect however this is a limitation of the number of ports and therefore how the sound card is managing the input feeds.

Ideas from anybody?