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lspci output

00:1b.0 Audio Device: Intel Corporation N10/ICH 7 Family High Definition Audio Controller (rec 02)

when doing alsactl init, it shows ALC272

I've been using it since Ubuntu 11.04 and 11.10 and mic was working, but since the update to 12.04 the microphone problem appears.

I tried to compile the Realtek alsa-driver for hda-intel but still the same,

Any idea?

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Take a look at this article from an Ubuntu developer about fixing on-board and external audio issues.

http://voices.canonical.com/david.henningsson/

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