Your screenshot corroborates the fact that mic boost is zeroed, which
generally results in very quiet or inaudible capture:

Simple mixer control 'Mic Boost',0
  Capabilities: volume penum
  Playback channels: Front Left - Front Right
  Capture channels: Front Left - Front Right
  Limits: 0 - 3
  Front Left: 0 [0%]  <---
  Front Right: 0 [0%]  <---

You actually need to set the slider to 100% or higher.

** Changed in: pulseaudio (Ubuntu)
       Status: New => Opinion

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acer aspire 1551 build in mic is not working in pulseaudio apps
https://bugs.launchpad.net/bugs/682065
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