So, we have a tripple confirmed "workaround" solution.

linux/Documentation/sound/alsa/ALSA-Configuration.txt

explicitly mentions:

options snd-hda-intel model="dell-3stack" for the "Dell Dimension E520",
which does not work for posters.

whereas

options snd-hda-intel model="ref" works for Dell Dimension E520 users.


A regression in the Linux upstream kernel, or Ubuntu specific?

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No sound on Dell Dimension E520
https://bugs.launchpad.net/bugs/363721
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