Installed the kernel update from lucid-proposed, and commented out the line 
options snd-hda-intel position_fix=1
in /etc/modprobe.d/alsa-base.conf

Then rebooted.

The hardware disappeared the first time I tried adjusting microphone
levels.

After doing "alsa force-reload" I tried again. Several times the driver
entry in the list flickered/"jumped" and reset the sound levels back to
where they were. (Not much good if I were doing serious sound work.)
Eventually, the driver entry disappeared altogether.

Reloaded again. The same behaviour persists, though I haven't managed to
make the driver disappear this time. It looks from the behaviour of the
indicator app in the panel that the driver is intermittently unloading
for about a second before reloading again.

For the moment, I'm going to revert to the previous kernel version and
alsa-base.conf settings.

-- 
Hardware device disappearing from Sound Preferences on ASUS 0x104381b3
https://bugs.launchpad.net/bugs/465942
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