Lenovo Ideapad 100 issues with 3.5mm combo jack

Hi,
just bought a Lenovo Ideapad 100, it works ok but had issues finding the right setting for the external microphone connection with the combo jack(4 rings) to have on the same connector HP & Mic.

You must persist to find the right settings if not you have noise of the room injected via the internal Mic of the Lenovo and impossible to set the right levels...

Just to say that at first you can think that the combo jack is not working at all.

Surely computers with standard HP & Mic(external) connections are easier to setup.

I nearly gave up with this one,don't be afraid to change what ever you can if not you will be for a big frustation.

Wish you all a Happy New Year 2017, all the best.73
Daniel VK4AFU