Acer H81h3-am Drivers -

This is common with Realtek drivers. After installing the driver, go to the Realtek Audio Console (or Realtek HD Audio Manager) and ensure "Disable front panel jack detection" is unchecked, or check the connector settings.

This remains the gold standard. Go to the official Acer Support website and enter your model. Acer H81h3-am Drivers

Because this is an OEM board, standard driver sources can vary: Download Acer Support Drivers and Manuals This is common with Realtek drivers

Power management or outdated driver.