According to the alsa-info.txt of the #20, it looks like the audio
driver did not detect the headphone/headset plugging event at all, if it
detects the plug/unplug event, the pulseaudio will automatically switch
the output from the speaker to headphone, don't need you to manually
change the alsamixer stuffs.
I guess after you plug in the headphone/headset, the output still only
comes from speaker, then you use some way (like using the pavucontrol
mentioned in the #13) to let the headphone work, but the driver and
pulseaudio still think the headphone is not plugged, as a result the
sound will be played out both from the speaker and headphone.
Please check /proc/interrupts on your machine, and notice the line end with the
key word snd_hda_intel, this is the interrupt count for sound driver, plug and
unplug the headset/headphone, let us see if this will trigger interrupt or not.
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external mic not detected on machines with alc256 codec
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