Install Acer Aspire One ZG5 microphone on Ubuntu 12.10

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http://askubuntu.com – I just installed Ubuntu 12.10 on a Acer Aspire One ZG5 (AOA 110), then Skype, and I can't make the microphone work. I tried this method with alsamixer https://help.ubuntu.com/community/AspireOne522#Microphone but it doesn't works. The sound is not recognized by alsamixer, nor by the sound settings. I tried to make a test call on skype, but I can't hearmy voice back. I read that previous versions of Ubuntu had some issues with the mic, maybe I have to debug something... I hope you can help me (HowTos)