I checked the sound preferences from the top menu bar (loudspeaker icon)
selected the input tab
selected the internal audio

the input level bar was moving erratically 
moving the slider for input volume level made only marginal effect on the 
movement of the bar 

when using the sound recorder application (setting to cd quality mp3)
after the recording of 5 sec (counting to 5), I only can hear a lot of
cracking noise (as if the signal is completely clipped ) but no counting

philip

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https://bugs.launchpad.net/bugs/877874

Title:
  internal microphone not working Acer one 522

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