the real cases are those desktop which does not use hda front audio
panel ,
they just loss the auto mute since there is no jack detect circuit but
they
can still hear sound from the headphone at anytime
do pulseaudio need a phantom port for the front panel headphone and mic without jack detection ?
Actually this is one good point. The jack detection isn't always reliably on such old machines, and BIOS cannot know, too. That is, it has to be adjusted by user manually, whether the jack detection is enabled or not.
So far, we solved this by providing "Auto-Mute Mode" mixer switch. But the jack detection controls don't follow this yet. Maybe we can set such a jack control as inactive state when the jack detection is disabled.
(And this reminds me that we can cut off "Phantom" name hack by following the same rule -- just set the control inactive when it has no real detection. But it still appears in control list.)
The other case is the bios of some computers with alc880 codec have pin defaults 0x00000000 for some pin complexes
https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1015232
hda jack detect need pin fixup
Pin Default 0x00000000: [Jack] Line Out at Ext N/A Conn = Unknown, Color = Unknown DefAssociation = 0x0, Sequence = 0x0
http://git.kernel.org/?p=linux/kernel/git/tiwai/sound.git;a=commit;h=67b6ec3...