This bug may be because of a problem in the ALSA configuration for the
sound card in the dv6000 series ("00:1b.0 Audio device: Intel
Corporation 82801H (ICH8 Family) HD Audio Controller (rev 03)" according
to lspci). There is a workaround in
http://ubuntuforums.org/showthread.php?p=7379259; however, the best I
was able to achieve was making the computer think the internal
microphone was the external one, which does work.

I'm attaching four screenshots of my HDAAnalyzer configuration (a
program which can be installed following the instructions for the above
forum post). In the radio buttons on the Node[0x23] page, "Pin Complex
[0x18]" was originally selected, but I changed it to [0x19]. I think
that the external mike was competing with the internal one, even though
it wasn't even plugged in. By changing [0x18] to [0x19], I think I freed
up the internal mike to be listened to. On the Node[0x19] page, which I
think is the output for the internal microphone, there is nothing in two
of the boxes. That might be a sign of where the bug is.

** Attachment added: "This is a screenshot of my HDAAnalyzer configuration."
   http://launchpadlibrarian.net/27349132/HDAAnalyzer%20config%20screenshots.zip

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internal microphone does not work in dv6000 hp laptop ubuntu 8.04 hardy
https://bugs.launchpad.net/bugs/282038
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