Comment 17 for bug 1562396

For fix please see towards the end of comments here.
But in a nutshell, the fix consisted of:

As local user, launch hdajackretask:
$ hdajackretask

* Select "show unconnected pins"

* Pin 0x0f override to (dropdown menu) --> Internal Speaker

* Pin 0x10 override to (dropdown menu) --> Internal Speaker (LFE)

* Pin 0x15 override to (dropdown menu) --> Headphone

Still received message:
"tee: /sys/class/sound/hwC0D0/reconfig: Device or resource busy"
but the above seemed to have worked.

To make this permanent click button:
"Install boot override"