Ah Daniel, I see what is happening now perhaps. First, I had to press F4
in alsamixer to enable all capture options. Once there, for "Input
Source" (there's also "Input Source 1" and "Input Source 2" so that's
slightly confusing), I see the options specified in the enum you pasted,
"Mic", "Front Mic", and "Digital Mic". Changing it to Digital Mic makes
the integrated microphone work, but it seems to be a bug that this isn't
available in the Sound Preferences applet. It has a "Connector" drop-
down in the Input tab with "Microphone 1" and "Microphone 2" which
correspond to the "Mic" and "Front Mic" options respectively, but no way
to select the third "Digital Mic" option.

So, it seems like that option is for some reason missing from the
Connector drop-down, and perhaps they should be named more usefully like
they are in alsamixer. Also, "Digital Mic" should likely be the default
for these models as it gives everyone a working recording experience.
Using Front Mic as the default seems less useful as for most cases the
integrated mic works fine; it would only be for more
serious/professional recording that you'd want to use a different input.

What are your thoughts Daniel?

-- 
[SigmaTel STAC9228] Recording problem - integrated microphone no longer 
available on Dell XPS 1330
https://bugs.launchpad.net/bugs/533877
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