[gentoo-user] no sound through headphones (still bad)

[allan gottlieb]

Hardware: Dell Latitude E7450 laptop

Gentoo essentially all stable
Gnome / Systemd

When I play a movie using totem it sounds fine if no headphones are
plugged it.

No sound at all with headphones.  I tried a few, one with a microphone
several without.

The gnome sound settings gui recognizes that the headphones are in but
the sound test is silent.  If, with the phones still in, I select the
internal speakers, all sounds well.

I installed pauvcontrol and selected "Output Devices".
When I selected "Speakers" as the port the volume meter moves around
normally and the sound is fine.
When I selected "Headphones (plugged in)" as the port the volume meter
again moves around normally but there is no sound.

This laptop dual boots windows.  I played the same movie on windows and
sound was normal both with the speakers and the headphones.

What should I try next?

thanks,
allan