Problem solved due to post #9 on
http://ubuntuforums.org/showthread.php?t=942529&highlight=sound

Here is the issue. PCM volume was set to 0 in alsamixer, however,
running alsamixer as recommended in the terminal only brings up the the
master volume. If you instead run 'alsamixer -Dhw' in a terminal it
brings up the master volume plus all the others. Here it is now possible
to see that PCM was muted and set it higher.

So the bug here is that PCM volume was inexplicably muted on some
intrepid update.

I am also unsure as to why -Dhw is now required when the alsamixer
command alone used to suffice.

I can file a new bug about this if it is helpful let me know. For now I
will mark the package as alsa if that is wrong please correct me.

** Changed in: pulseaudio (Ubuntu)
Sourcepackagename: linux => pulseaudio

-- 
no sound HDA-intel AD1984
https://bugs.launchpad.net/bugs/288861
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