I've been experimenting  and It may not be a pulseaudio issue, it may be
the snd-hda-intel driver being incorrectly loaded.

/etc/modprobe.d/alsa-base.conf 
adding model=basic/auto/acer ...
options snd-hda-intel model=auto power_save=10 power_save_controller=N

seems to be reflected in pulseaudio with connectors appearing with some
configurations. at one point i had mic1 mic2 and line in as options. no
working internal mic but it looks promising.

this document may help
http://www.kernel.org/pub/linux/kernel/people/tiwai/docs/HD-Audio.html

-- 
Internal microphone doesn't work on Asus eeePC 1005HA
https://bugs.launchpad.net/bugs/449855
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