Try installing "firmware-intel-sound" package from "non-free"
section and reboot. The problem could be resolved just by doing
that.
If not send us output from these commands:
$ aplay -lL | grep -ie '^sysdefault' -ie '^hw' -ie '^card'
$ lspci -knn | grep -2 -ie 'audio'
--
With kindest regards, Alexander.
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