Note the arrows below, particularly how for 'Mic' the capture level is
set to zero and how for 'Mic 1' the capture is completely muted:

 Simple mixer control 'Mic',0
   Capabilities: cvolume cswitch cswitch-joined cswitch-exclusive
   Capture exclusive group: 0
   Capture channels: Front Left - Front Right
   Limits: Capture 0 - 80
   Front Left: Capture 0 [0%] [-74.00dB] [on]  <---
   Front Right: Capture 0 [0%] [-74.00dB] [on]  <---
 Simple mixer control 'Mic 1',0
   Capabilities: cvolume cswitch cswitch-joined cswitch-exclusive
   Capture exclusive group: 0
   Capture channels: Front Left - Front Right
   Limits: Capture 0 - 80
   Front Left: Capture 6 [8%] [-68.00dB] [off]  <---
   Front Right: Capture 6 [8%] [-68.00dB] [off]  <---

-- 
Microphones not working on Dell Vostro 320
https://bugs.launchpad.net/bugs/497546
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