I plugged both Apple and Windows versions of headsets into the headphone port - no interruption in external sound as there should be. Tried update to sound drivers via Windows 10. Headphone still not functioning. Is there a separate AMD driver for the MH80?
The audio output of HM80 is suitable for TRRS and TRS type plug earphones, and not for Apple earphones. According to your description, you can check whether the driver of HM80 is complete. Or you can check whether the headphone jack is in bad contact. Or you can check the sound output.