I finally founded a fix to no-sound problem, model is needed to set to
3stack.
I modified /etc/modprobe.d/alsa-base.conf and added line:
options snd-hda-intel model=3stack
then sudo alsa force-reload and after that i can get sound.
This bug can be closed.
** Changed in: linux (Ubuntu)
Status: New => Fix Committed
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Lenovo ThinkCentre M55 no sound, AD1986A
https://bugs.launchpad.net/bugs/308872
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