I have a worse bug : after setting alsamixer to 6ch and restarting pulseaudio, 
I have no rear sound and no dialog in 5.1 application (I select a 5.1 profile 
in pulseaudio
+ the sound section in Ubuntu setting pannel is unable to test the speakers 
(they remain silent while the system sound can actually be played in other 
manner).
This occurs at least in Ubuntu 20.04 and 21.04

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https://bugs.launchpad.net/bugs/1505584

Title:
  [Realtek ALC887-VD] Playback only through 2 channels by default

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