I found a great guide on the HDA codec:
http://www.kernel.org/pub/linux/kernel/people/tiwai/docs/HD-Audio.html#_codec_probing_problem

After reading it I realised that I experienced a "Codec-Probing
Problem": the modem was asigned to the first codec slot while the "real"
codec was assigned to the fourth slot. Therefore, I added "probe_mask=8"
as an option and now I have sound! Furthermore, the devices in alsa-
mixer are correct now: I have a capture device and can select Mic or CD
as Input-Source.

However, one problem remains: recording doesn't work! When recording
with audacity, the time-slider doesn't move forward but is constantly
flickering. And when using GNOME's sound recorder, recording stops
immediately after starting it and the app crashes on exit each time.
PA's "volume meter" for recording doesn't show anything either. I'm
running out of ideas right now...

One note: I had to remove the "model=toshiba" option. When it's enabled,
the devices are also messed up within alsa-mixer (although in a
different way than without probe_mask=8) and sound doesn't work!

I hope that the "probe_mask" option will help you too! To check if you
have a codec-probing problem, look at "/proc/asound/card0/codec* and see
if the modem has a lower slot than the soundcard.

Regards

-- 
[karmic]snd_hda_intel: audio moves to polling mode and starts repeating 
(Toshiba A100-259/ATI IXP SB4x0 HD/ALC861)
https://bugs.launchpad.net/bugs/391114
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