use
amixer -c0 set "Channel Mode" "6ch"
save your mixer setting before shutdown
alsactl store
restore your setting after boot and before pulseaudio start
alsactl restore
Alsactl output
!!-------------
--startcollapse--
state.Intel {
control.1 {
iface MIXER
name 'Channel Mode'
value '2ch'
comment {
access 'read write'
type ENUMERATED
count 1
item.0 '2ch'
item.1 '4ch'
item.2 '6ch'
}
}
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https://bugs.launchpad.net/bugs/1309950
Title:
[G31M-ES2L, Realtek ALC883, Blue Line In, Rear] No autoswitch
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https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1309950/+subscriptions
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