Just few additional information:
1. I tested it on 32bits version and it does not work too
2. adding in the file /etc/modprobe.d/alsa-base.conf the following setting:
options snd-hda-intel probe_mask=3 position_fix=1 model=acer
the external microphone (connected to the jack) works.
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Microphone does not work with ATI IXP SB4x0
https://bugs.launchpad.net/bugs/481026
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