Just another observation: switching back and forth between Speakers and
Headphones sometimes puts the headphones into the Telephony Duplex mode.
Even though the High Fidelity Playback seems to be selectable, the Test
Sound button only results in the Mono test being offered. A workaround
is to turn off the headphones in the Bluetooth drop-down panel and then
turn them back on. The headphones then re- appear in the "Play sound
through" list with the Settings for Headset showing High Fidelity
Playback and the Test Sound button allowing testing of right and left
hand channels. (If the Telephony Duplex mode is selected, the Test Sound
button allows Mono testing as expected.)

This further suggests that the kernel is not necessarily recognising the
full features of the Bluetooth headset every time that they are
selected.

(Whilst writing this, I am continuing to monitor the sound output of the
Videos app. It appears to be stable without any interference from the
Firefox Web Browser!)

Also, the laptop has warmed up since the previous report when it was
switched on from cold. Hopefully the hardware is not sensitive to
temperature.

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

Title:
  PCI/internal sound card not detected

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