So I updated the latest Realtek HD Audio driver 126.96.36.19942 ,A04. This resulted in a situation where if I unplugged my headphones, and then plugged them in again, the audio remained on the laptop speakers, but would not switch back to the headphones. To get things to work again I uninstalled the Realtek HD audio driver, installed the older version 188.8.131.5251,A03, and then updated following these instructions:
That got things back to the way I had it before...working.
Solved! Go to Solution.