Another observation to add to the above.

I switched on the laptop from cold. It seemed to boot up correctly and
the Speakers (Built-in Audio) were showing in the "Play sound through"
panel of System Settings > Sound > Input. I started to play a video
through the Videos app and noticed a slight crackling, the sound
playback becoming intermittent. I then switched on a pair of Bluetooth
headphones and, since Bluetooth was on by default, the headphones
immediately connected and started playing the sound track. I then looked
at the System Settings > Sound > Input panel and found that, although
the Headset was listed under "Play sound through", they were not
highlighted; the Speakers remained highlighted instead even though the
sound was coming through the headphones. Using the trackpad to click
between the two caused the sound output to be switched between Speakers
and Headset. (The sound playback has remained clear and free from
crackles since then and continues to play correctly whilst I am typing
this comment using Firefox web Browser.)

The mystery deepens. Perhaps someone who understands the kernel
operation knows where the bug lies. I do hope so.

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

Title:
  PCI/internal sound card not detected

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