Solved. Thank you very much.
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https://bugs.launchpad.net/bugs/1881691
Title:
[Vostro 3470, Realtek ALC891, Black Headphone Out, Front] No sound at
all
To manage notifications about
It is a known issue, just fixed in the pulseaudio, please try latest
pulseaudio ubuntu3.3? If it doesn't work, please talk to Kaiheng, he
knows what exact version will include the fix.
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