A workaround exists:
--------------------
* Add "options snd-hda-intel index=1" into /etc/modprobe.d/alsa-base.conf
* Restart OS
* When login screen appears, sound works ✔️. Actually the device "Speaker -
HD-Audio Generic" is used instead of "Speaker - Family 17h HD Audio
Controller", but sound works well.
* When I login, sometimes sound stops working ("Dummy Output" again), but then
it's enough to run "pulseaudio -k" (pulseaudio is restarted) and I can hear
sound
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https://bugs.launchpad.net/bugs/1901901
Title:
Yoga Slim 7: Sound output device is not detected after upgrade from
Ubuntu 20.04 to 20.10
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