FWIW I'm not using pulseaudio, so no pactl here.

2.1 works fine since the discovery of the subwoofer pin.

Attached are the requested alsa-info.sh outputs.

Not sure about what you mean if the subwoofer needs both left and right
channel:

If it's that if I could use the subwoofer alone without the speakers,
that's doable, it's just a matter of muting "Speaker" and leave "Bass
Speaker" on, and then I have output just from the subwoofer.

If it's that if I can control left and right channels for the subwoofer
itself, I can, using the hda_analyzer at the node 0x1a, under the output
amplifier group "Val[0]" seems to mute a half of the subwoofer and
"Val[1]" mutes the other, seriously I don't know how that happens, I
always assumed the subwoofer to be a single speaker, but there it is.

As an additional note, the subwoofer is tied up to the Audio Mixer at
node 0x0e (Attached hda_analyzer screenshot as well for it), muting
"Val[0]" mutes all left output (as in Speakers, Subwoofer) and "Val[1]"
does the same but with the right channel.


Thanks again.


** Attachment added: "alsa-info.unplugged-mono.txt"
   
https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1302090/+attachment/4087687/+files/alsa-info.unplugged-mono.txt

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https://bugs.launchpad.net/bugs/1302090

Title:
  Dell Alienware 14, Speaker sound output is mono until a headphone jack
  is plugged

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