Also affects 201303-13027 Dell Inspiron 5535

Verified with 12.04.3 (3.8.0-29) and update (3.8.0-33)
But the audio chips are quite different
00:01.1 Audio device [0403]: Advanced Micro Devices [AMD] nee ATI Device 
[1002:9902]
00:14.2 Audio device [0403]: Advanced Micro Devices [AMD] Hudson Azalia 
Controller [1022:780d] (rev 01)

Furthermore, these systems all have a 2-in-1 headphone socket
and this issue did not happen on 201302-12844 Dell Latitude 3330, which 
equipped with:
00:1b.0 Audio device [0403]: Intel Corporation Panther Point High Definition 
Audio Controller [8086:1e20] (rev 04)


** Attachment added: "alsa-info-201303-13027.txt"
   
https://bugs.launchpad.net/ubuntu/+source/linux-lts-raring/+bug/1249956/+attachment/3906069/+files/alsa-info-201303-13027.txt

** Tags added: 201303-13027

** Summary changed:

- [Dell Latitude E6440] External microphone cannot be detected
+ External microphone cannot be detected

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https://bugs.launchpad.net/bugs/1249956

Title:
  External microphone cannot be detected

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