[SRU][Bionic][Artful][OEM][PATCH] Let headset-mode initialization be called on Dell Precision 3930

[Hui Wang]

BugLink: https://bugs.launchpad.net/bugs/1757584

There is only one audio jack on this machine (codename: zuma-p), so
there is only one output device (headphone), then the driver will not generate
auto-mute control on this machine, without auto-mute, the headset-mode
initialization routine will not be called, as a result, all audio devices
can't work (output and input). To fix it, add a dummy lineout on this
machine, then there are two output devices (headphone + lineout), the
driver will create auto-mute control on this machine finally.

Due to the patch conflicts, I prepared two patches, one is for artful+oem,
the other is for bionic.

[Test Case]
plug the headset and play or record the sound on this machine, both playing
and recording work well.


[Fix]
one commit from mainline kernel.

[Regression Potential]
very low, since this patch only applies to the specific Dell machine Precision 3930.



Kailang Yang (1):
  ALSA: hda/realtek - Add headset mode support for Dell laptop

 sound/pci/hda/patch_realtek.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

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2.7.4