Just to add even more complication to the issue:

Having restarted the system yet again, I find that the Sound > Output
pane is now showing the Speakers, Built-in Audio under the Play sound
through list. The Test Sound button now works as expected and the Fn-F11
& F12 keys control the Output Volume slider (producing the adjustment
"pop" from the speakers into the bargain).

The problem really is one of intermittent detection and operation of the
sound hardware.

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https://bugs.launchpad.net/bugs/1402194

Title:
  PCI/internal sound card not detected

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