[Bug 1805079] Re: click/pop noise in the headphone on several lenovo laptops

The script uploaded the info under random names, but they're the same
anyway.

Quiet:
http://www.alsa-project.org/db/?f=7712362b1f31c1c142d4016983e648b99d8e5036

Not quiet:
http://www.alsa-project.org/db/?f=579cbfe2a915281a46e449a07b4f359917191943

I also generated one without the 0x12 line:
http://www.alsa-project.org/db/?f=d439ec39632f226a7c156df5373df31de28f4a53

Thank you!

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https://bugs.launchpad.net/bugs/1805079

Title:
click/pop noise in the headphone on several lenovo laptops

Status in linux package in Ubuntu:
Fix Committed

Bug description:
[Impact]
Lenovo told us that some linux uers reported headphone noise on Lenovo's
website. After investigating, we found those Lenovo laptop mdoels all
have the codec of alc285, and we can reproduce the noise problem too.

[Fix]
Don't use the DAC of headphone, let headphone share the DAC with speaker,
the noise disappears.

[Test Case]
After applying this patch, we tested on Lenovo P52, P72, X1 carbon and X1
Yoda2, no noise anymore

[Regression Potential]
Low. This patch only apply to several lenovo machines, and after applying
this patch, both speaker and headphone still work very well.

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