System: Ubuntu 9.10 64bits
ALSA: 1.0.20
PA: 9.19

audio devices (lsusb):
00:14.2 Audio device: ATI Technologies Inc SBx00 Azalia (Intel HDA)
01:05.1 Audio device: ATI Technologies Inc RS780 Azalia controller
Audio card is recognized as VT1708.

Problem appear even if I upgrade Alsa to 1.21 and Pa to 9.21.

Using ALSA(0.20/0.21) as only sound system there is no problem with
using internal mic. However Alsa is unable to mix sound from multiple
apps so I must use PA. When using PA mic is active, which can be check
in System/Preferences/Sound, bookmark IN/Entrance/Record where the
progress bar changes value while I talk. Problem occurs when I lunch
recording program (Skype, System Recording). Sometimes I can use my mic
but in 99% of cases mic go to silent (and there is no move on System
Preferences progress bar).

-- 
No record-signal from internal mic (Notebook, Sigmatel, HDA Intel)
https://bugs.launchpad.net/bugs/480815
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