pulseaudio use jack detection control to determine the available port
take a look at the pulseaudio verbose log how pa switch to line out when
headphone is not plugged
it also check the hdmi jack detection control to determine whether hdmi
is available nor not
control.34 {
iface CARD
name 'Line Out Jack'
value true
comment {
access read
type BOOLEAN
count 1
}
}
control.35 {
iface CARD
name 'Front Headphone Jack'
value false
comment {
access read
type BOOLEAN
count 1
}
}
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https://bugs.launchpad.net/bugs/1231730
Title:
[System Product Name, ATI R6xx HDMI, Digital Out, HDMI] Playback
problem
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