20.04 HDA-Intel speakers only work when headphones are unplugged

[David L]

Hi,

I recently installed 20.04 on a system that previously had 18.04. One
difference the I've seen is that I can't get sound from the front speakers
when the mic is plugged in in 20.04. This behavior is different from 18.04
where I could control the speaker volume independently using a command like:

amixer -c1 -d set Front 30

pulseaudio shows both front speakers and headphones are plugged in, and
there are controls for both, but the speakers do nothing in 20.04 when the
headphones are plugged in as far as I can tell. Any workaround for this new
behavior other than physically plugging/unplugging the headphones?

Relevant /proc/asound/cards output:
 1 [Generic        ]: HDA-Intel - HD-Audio Generic
                     HD-Audio Generic at 0xf7f00000 irq 118

Thanks,

       David

PS - pulseaudio is buggy on this system (and every other computer I've ever
used), but the alsa controls were solid in 18.04.
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