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

[Raymond Yau]

> >
> >> - speakers do not output _any_ sound whatsoever anymore
> >
> >Are you using PulseAudio or without?  Try to check without PA at
> >first.
>
> I never use PA, so this is all with plain ALSA.
>
> >In anyway, get alsa-info.sh outputs at the headphone plugged and
> >unplugged on both 3.17.x and 3.18.x kernels.  Run the script with
> >--no-upload option and attach them.
>

If Combo audio connector does not support conventional microphone, this
mean the driver should not create mic jack control for node 0x1a

http://support.lenovo.com/us/en/documents/pd029567

Connect headphones or a headset that has a 3.5-mm (0.14-inch), 4-pole plug
to the combo audio connector to listen to the sound from the computer.

Notes :
• If you are using a headset with a function switch, for example, a headset
for an iPhone mobile digital device, do not press this switch while using
the headset. If you press the switch, the headset microphone will be
disabled, and the integrated microphones on the computer will be enabled
instead.

• The combo audio connector does not support a conventional microphone.