Workaround that seems to work (Ubuntu system with systemd and
pulseaudio)

Create this file "~/.config/systemd/user/pulseaudio.preconf.service"
with this content



[Unit]
Description=Sound Service PreConf
ConditionUser=!root

[Service]
Type=oneshot
ExecStart=amixer set "Channel mode" "6ch"

[Install]
WantedBy=pulseaudio.service





systemctl --user enable pulseaudio.preconf.service

and restart

This mixer setting should be persistent automatically across reboots.
And for pulseaudio integration, it should be able to configure this
setting in the GUI

** Also affects: pulseaudio (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: alsa-driver (Ubuntu)
       Status: Expired => Confirmed

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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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