After messing around for another  while, the internal mic works in the
end.

What I have done is the following:

1.- Install latest ALSA driver according to 
http://monespaceperso.org/blog-en/2010/05/02/upgrade-alsa-1-0-23-on-ubuntu-lucid-lynx-10-04/
Microphone levels have to be raised after install, for instance wirh alsamixer
2.- Add following line to /etc/modprobe.d/alsa-base.conf: 
options snd-hda-intel model=auto

Step 2 made the difference. In Karmic Koala the line to be added was 
options snd-hda-intel model=m51a 
which apparently doesn't work in Lucid Lynx. 

Hope that this solution can be useful to whoever has the same sound
card. May be step 1 is not necessary.

-- 
Internal microphone doesn't work in ASUS M51V, Ubuntu 10.04. External 
microphone does
https://bugs.launchpad.net/bugs/636876
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