I just got an Aspire A515-56 laptop and the microphone output is almost nonexistent. In the test areas the volume bar barely shows any output. Using the voice recorder and Skype test I can barely hear my voice. I installed the drivers available on the Acer support download for my serial number. It made the speakers quit working, so I restored from the restore point. I have done a reset from the hard drive and a reset directly from Microsoft, still no joy.
Speakers work fine and are adjustable. Settings/System Sound/Sound/Test your microphone shows the volume bar with a blip from time to time, if I speak very loud. If I select Device Properties there is an option to test the microphone and I can set the bar to 100%, but then it immediately drops back to 54% if there is another app accessing the microphone, like Skype. When speaking it will go up to 40%, volume when the maximum is set to 100%. If I close one app I have to go back to Device Properties for the mic and reset the maximum volume to 100%. It seems to stay there if I don't access any other app that uses the microphone. There is also "additional device properties" with a "level" tab, but that setting matches the setting for in Device Properties.
Is there any driver available other than the ones on the Acer site? Is there any other volume output adjustment I can make?