Why is this bug marked as invalid?

I believe I am also affected by this bug.  I have the same model of Dell
(Precision 3510) with a Realtek ALC3235.  Audio worked correctly with
Ubuntu 14.04 which was pre-installed by Dell.  After upgrading to 16.04
I have the issue.  When I look in sound settings nothing is listed
within the "Play audio through" list under the Output tab.  I have been
able to use alsamixer to get audio to work when this happens.  It seems
that the internal speaker has been muted.  I recently ran "apt update"
and then "apt upgrade" and now I cannot get audio to play through the
internal speaker even with alsamixer.  The problem seems to have gotten

If I connect a headset or an external docking station, audio works fine
with those devices.  They appear as normal within sound settings.  And I
am able to configure them without any problem.

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  [Precision 3510, Realtek ALC3235, Speaker, Internal] No sound at all.
  Resets to mute. No 'Play Sound Through' options

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