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

Awesome fix, Hui Wang, thank you!

I'm on Lenovo ThinkPad X1 Carbon 6th, model 20KH006JGE. After upgrading
to Linux 4.19.7, the audio mute and microphone mute LEDs (on F1 and F4
keys) stopped working. They do work if I remove the line:

{0x12, 0x90a60130},

Just removing it doesn't sound like the greatest idea, but I couldn't
find the ALC285 datasheet online. If you could direct me to information
about ALC285 registers so that I can fix the issue, or provide me with
another value for the register so that I can test it, it will be greatly
appreciated.

Many thanks,
Vadim.

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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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