Same here. Very low volume with pulseaudio and ICH6, older Sony VAIO laptop 
VGN-S505.
00:1b.0 Audio device: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) 
High Definition Audio Controller (rev 03)

I have a simple but not elegant solution.

1) Open volume control.
2) Preferences
3) Enable "Microphone", "Capture" and the first "Input Source"
4) Close Preferences
5) Click "Options" tab
6) Change the input source to "Front Mic"
7) Try to record something.
8) Change the input source to "Mic"
9) Recording now works.

Somehow changing the input source away from "Mic" to "Front Mic" and
back to "Mic" does something to the sound system. The result is that I
am now able to record sound appropriately, and Skype works correctly.

-- 
internal mic capture very low volume when routed through pulseaudio
https://bugs.launchpad.net/bugs/275998
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