I had the same problem, and on my laptop, I solved it. I hope this is helpful to anybody else.
Just plug out and in again your mini-jack. A menu pops up, allowing you to select your device:
Line in
Mic in
headphone
speaker out
headset
I selected MIC IN
Then go to Windows settings and type SOUND
Another window pops up :SOUND
goto page RECORDING, there you will find your choices: in my case:
MICROPHONE ARRAY
STEREO MIX
HDMI
dobble click on MICROPHONE ARRAY
Microphone array properties pop up
select page LISTEN
tick the box LISTEN TO THIS DEVICE
APPLY
OK
The same way I can switch to HDMI sound input
I hope it works with you.