Good news! Upstream has written a solution today and wishes for some testing. 
I've packaged it up in a debian package. Please do the following:
1) Download and install the alsa-hda-dkms package just posted
2) Reboot
3) start Alsamixer (see https://wiki.ubuntu.com/Audio/Alsamixer ), make sure 
"Inverted Internal Mic" is muted
4) now try recording normally from Internal mic.

The following machines are added in this package: 
Asus U41SV
Acer 1810TZ
Acer D260 (from bug 996611 )
Acer eM350
Lenovo S205

Please report back whether it works or not. Thanks!

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https://bugs.launchpad.net/bugs/1002978

Title:
  [meta-bug] Inverted Internal microphone (phase inversion)

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