Ok. Here's a big hint.  All I have to do is edit and save
/etc/modprobe.d/lanai-sound.  To start, I had

options snd-hda-intel model=dell-3stack

When I commented this line out and restarted, I had sound. To check, I
tried restarting a second time. No sound. I then went back and added and
deleted a whitespace to the lanai-sound file and saved it.  Note that
all the lanai-sound file now has in it is the options line above
commented (#) out.  Restarted the inspiron and sound came back.

So it's not the content of lanai-sound that matters. It's whether it's
new or not.  What is that about?

-- 
No sound in Dell Inspiron 1420 in Jaunty
https://bugs.launchpad.net/bugs/363892
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