Not sure if my problem is related to this one but the symptoms sure are 
similar. I've got a spanking new Sony VAIO CW-series notebook and after a fresh 
install of 9.10 Sound was working perfectly, playback, the internal digital 
mic, my bluetooth headset (including A2DP), the lot. But soon after some 
upgrade broke a bunch of stuff, here's an assessment of the situation:
- Internal mic doesn't work. Alslamixer reports three capture devices but only 
lets me choose between "front mic, mic, line and CD", not a word of the digital 
input there.
- Line in jack on the computer works but I haven't got an external mic so 
that's not of much use (tested it with headphones)
- I'm having problems with audio playback from Spotify running under Wine. 
Sound crackles, sometimes stutters and occasionally the entire application 
stops outputting sound at all.
- Bluetooth headset no longer works as sound input but playback works fine(!)

I've tried upgrading alsa to 1.0.22 but still no go.

-- 
dell xps m1330 regression, integrated digital microphone no longer working 
[karmic koala]
https://bugs.launchpad.net/bugs/453966
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