[alsa-devel] Regression for Lenovo X240 sound in 3.18

[Raymond Yau]

> >
> >control.14 {
> >iface CARD
> >name 'Mic Jack'
> >value false
> >comment { access read type BOOLEAN count 1 } }
> >
> >What is the usage of this jack detect control if conventional mic is not
> >supported ?
>
> "jack detect" reads like "detect if something is present", and that
> is overly general, which could also mean it is used to detect
> when to turn off the built-in speaker.

https://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/commit/sound/pci/hda?id=7c21539c45eace48e9f6fbdd59347d8416960af5

Seem those dock stations also have combo jack but the patch did not create
dock headset mic jack / dock headset mic phantom jack

ThinkPad® Ultra Dock(40A20090XX),
ThinkPad® Pro Dock (40A10065XX),
ThinkPad® Dock (40A00065)

http://support.lenovo.com/en/documents/pd028010

http://support.lenovo.com/en/documents/pd028011

1x Stereo/Mic Combo Audio Port

Refer to the maunal of those dock station, the icon near the combo jack is
also a headset