W00T. Success. Unfortunately, I was getting frustrated so I was kind of throwing commands at the system and I'm not sure which one(s) solved it. I'll try to retrace here, but I'm not sure I have it exactly right.
I installed
was already installed.
(Edited to add: I should mention that the reason I didn't have firmware-sof-signed already is that it's a "non-free" package, and my /etc/apt/sources.list didn't have that before. Changed it to:
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deb http://ftp.nz.debian.org/debian/ testing main contrib non-free
)
Nothing changed, so I tried to revert the options line as per the archlinux post, but it wasn't clear to me where that options line went. Presumably into /etc/modprobe.d/inteldsp.conf ? But that file wasn't already in /etc/modprobe.d, so I created it and put the line in, but that didn't help.
When I reviewed the pipewire instructions, I noticed a paragraph talking about installing
, but that gave me an error about being unable to install the pipewire-alsa dependency because of held packages. But I don't have any held packages, which showhold confirmed. So I tried to install using aptitude instead.
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sudo aptitude install pipewire-audio-client-libraries
That actually installed after pulling in about five dependencies and deleting about three pulseaudio files it disliked. Felt a bit nervous telling it to go ahead....
Then ran as user:
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$ systemctl --user --now enable wireplumber.service
and rebooted ...
and suddenly had sound!
Thanks so much for your help!