Hey Manjo,

I'm not convinced this would be the most appropriate fix for this but in
bug 389040 I'd found some patches for this sound card and codec that
were from way back in Hardy (not sure why they were never merged
upstream).

http://mailman.alsa-project.org/pipermail/alsa-
devel/2009-May/016917.html

And it seemed to reference a patch to enable audio:

http://kernel.ubuntu.com/git?p=ubuntu/ubuntu-hardy-
lum.git;a=commitdiff;h=7662834bb9a78d244c6d7ee43358c14c94d249c9

There also seemed to be a series of patches which followed to mute the
speakers when the headphones are plugged in:

http://kernel.ubuntu.com/git?p=ubuntu/ubuntu-hardy-
lum.git;a=commitdiff;h=d47775d68efa5d80552839231fcb4f54dc254c08

And then enable the microphone:

http://kernel.ubuntu.com/git?p=ubuntu/ubuntu-hardy-
lum.git;a=commitdiff;h=cc28eee26d33fac60d598fb2269e673ba83570e9

I'd forward ported the above patches to Jaunty and had positive feedback
from testers:

http://people.canonical.com/~ogasawara/lp389040/jaunty/

Unfortunately trying to forward port once more to Karmic resulted in the
built in mic not functioning any longer, so they're not perfect but may
help.

-- 
[karmic] no sound on toshiba nb205
https://bugs.launchpad.net/bugs/438318
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