Weird, even you plug the headphone before booting, the headphone is
still not recognized. I don't know why your headphone could work in this
situation.
this is from #3:
control.11 {
iface MIXER
name 'Headphone Playback Switch'
value.0 false
value.1 false
comment {
access 'read write'
type BOOLEAN
count 2
}
}
So, maybe the front headphone jack routes to usb sound card?
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https://bugs.launchpad.net/bugs/1893566
Title:
[MS-7A40, Realtek ALC887-VD, Green Headphone Out, Front] fails if
headphone not plugged in on bootl
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