Thanks for the quick response, but it doesn't seem to make any difference. 
Summary:
I've tried model=dell, dell-m43, dell-m44, ref, 3stack, 5stack and auto - 
similar behaviour with all (with "ref", both mics are dead)
"modinfo" shows the correct (ppa version) module is loaded.
The Input tab in Sound -> Preferences only shows one input source.
External mic works when plugged in at boot time.
Codec: SigmaTel STAC9205
Also upgraded pulseaudio to 
1:0.9.22~0.9.21+stable-queue-32-g8478-0ubuntu4~~karmic~ubuntuaudiodev1 (does it 
have any bearing on the issue?)


> Please install linux-alsa-driver-modules-2.6.31-19-generic from the
> ubuntu-audio-dev PPA and reboot.

>On Mon, Feb 15, 2010 at 11:39 AM, Srix wrote:
>> I find the same problem on a Dell Vostro 1500 (kernel 2.6.31-19-generic,
>> alsa-base 1.0.20+dfsg-1ubuntu5, pulseaudio 1:0.9.19-0ubuntu4.1). All

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External microphone jack not working on Dell Studio 1735 notebook.
https://bugs.launchpad.net/bugs/479410
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