[Artful/linux-oem][PATCH v2] system can't detect external microphone with the codec alc274

[Hui Wang]

BugLink: http://bugs.launchpad.net/bugs/1731822

This is v2, comparing to v1, I add SRU justification template here.

This patch is only for Artful and OEM kernel.

This patch is in v4.14-rc, so it will be in the Bionic kernel automatically.

Neither Xenial kernel nor Zesty kernel supports alc274 well yet, they lack lots
of functions like setting coefficient for eapd, headset mode, mic_in mode, ctia
and omtp mode. So only applying this patch is not sufficient to fix this bug.


[Impact]
There is a headset jack on this machine, after plugging the headset, the
headset-mic can't be detected, as a result we can't record sound with this
mic.


[Test Case]
plugging the headset and checking the sound-setting to verify the headset-mic
shows up. And recording sound with this mic, it works well.

[Fix]
adding the pin definition to quirk table, then this machine will be applied
ALC269_FIXUP_DELL1_MIC_NO_PRESENCE.

[Regression Potential]
No, it does not change any existing functions.


Hui Wang (1):
  ALSA: hda - fix headset mic problem for Dell machines with alc274

 sound/pci/hda/patch_realtek.c | 5 +++++
 1 file changed, 5 insertions(+)

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2.7.4