Please note the following mixer settings for your built-in mic:
Simple mixer control 'Mic Boost',0
Capabilities: volume penum
Playback channels: Front Left - Front Right
Capture channels: Front Left - Front Right
Limits: 0 - 2
Front Left: 0 [0%] <---
Front Right: 0 [0%] <---
[...]
Simple mixer control 'Capture',0
Capabilities: cvolume cswitch penum
Capture channels: Front Left - Front Right
Limits: Capture 0 - 31
Front Left: Capture 21 [68%] [15.00dB] [on] <---
Front Right: Capture 21 [68%] [15.00dB] [on] <---
The mic boost for your built-in mic is zeroed, and the capture level is
fairly low.
** Changed in: alsa-driver (Ubuntu)
Status: New => Incomplete
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input audio volume low or staticy
https://bugs.launchpad.net/bugs/677330
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