I found a fix for the speakers and several other issues.
I submitted the patch to the alsa-devel mailing list, where it was applied by
one of the sound subsystem maintainers. It will now slowly travel towards
mainline.
https://mailman.alsa-project.org/pipermail/alsa-
devel/2022-July/204315.html
I am experiencing a similar problem to the one described here, but on the more
recent "Yoga 9 14IAP7".
It does also use the ALC287 in a similar configuration.
The speaker-bar above the keyboard works out of the box, but the bass
speakers do not work.
'$ cat /sys/class/sound/hwC0D0/subsystem_id'
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