Comment # 9 on bug 964621 from Darren Freeman

Performed alsa-info.sh --no-upload, performed pactl list sinks >file1.txt .

Then suspended, resumed. Sound was still coming out of the earphone jack.
Suspended, resumed. Now sound was coming out of the internal speakers, which is
not the correct behaviour.

Performed alsa-info.sh --no-upload, performed pactl list sinks >file2.txt .

Then I removed and reinserted the audio jack, the problem went away.

Hopefully you can tell what's going wrong.