Just speculating, as I don't know the mechanics of dual-mic noise
cancellation, but is it possible that in some Eee PCs the physical
location of the microphones is swapped, causing the inverted noise
cancellation pattern? If so, could a basic kernel / ALSA update swap the
microphones back in software?

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Eee PC internal microphone inverts noise cancellation
https://bugs.launchpad.net/bugs/331130
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