I had the same problem.
Don't know how I really fixed it but what I did was
Open Device Manager
Uninstalled the HD Audio Controller with the flag
Uninstalled all non-hidden audio under sound, video and game controller section
Shut down the laptop and then start it up again
Held down the power button for 50 seconds (I counted)
Unplugged the adapter
There is a small hole in the bottom of my msi, used a pin to click the button. It resets your battery.
Took a deep breath
Plugged in the adapter and turned on the laptop
Magically it reinstalled what I needed and my audio was back as if nothing ever happened.
Took me half a day of playing around with settings, but this method worked.