A further observation today:

Turning the laptop on from cold, the speakers appeared in the Sound pane
as expected. When testing the Videos app, the sound played normally at
first but a few crackles were heard. This seemed to have coincided with
setting the display to Full Screen. The sound from the speakers then
disappeared completely.

On executing a restart, there was nothing listed in the "Play sound
through pane". After two further restarts, the Built-in Speakers were
listed but accompanied by settings for HDMI/Video port showing options
of HDMI sound. This persisted after another restart.

I turned on a pair of Bluetooth headphones and these subsequently
appeared in the "Play sound through" panel with options for Telephony
Duplex (HSP/HFP) or High Fidelity Playback (A2DP) being offered. The
Test Sound button payed the test signal correctly through the
headphones.

When re-selecting Speakers, Built-in Audio, the correct Settings for
Speakers (Balance and Greyed-out Fade and Subwoofer) appeared. The Test
Sound button allowed the left and right speakers to be tested as normal.

This suggests that the kernel loses its connection to the speakers which
is not necessarily reset on restart. However, the operation of switching
between Bluetooth headphones and the speakers does seem to restore the
connection and the correct functionality.

I should be happy to test out the latest kernel software but I need
advice as to how to do this (files to download and commands to execute
via terminal) if anyone is able to help on this.

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

Title:
  PCI/internal sound card not detected

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