Please open /etc/modprobe.d/alsa-base.conf in an editor, as root/using
sudo. Add the following line to the bottom of the file:

options snd-hda-intel model=acer


Save the file, and reboot. Please report back as to whether this fixes your 
microphone issues.

 affects ubuntu/alsa-driver
 status incomplete


** Changed in: alsa-driver (Ubuntu)
       Status: New => Incomplete

-- 
[Realtek ALC272X] Recording problem
https://bugs.launchpad.net/bugs/653266
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