I am using an X1 Carbon Gen 6 (BIOS 1.31) with Ubuntu 18.04.1 LTS, and I
too experience the popping sounds in the left-channel of my headphones
(this does not occur when connecting the same headphones with a 3.5mm-
to-USB-C adapter to the second USB-C port).

Other than that issue, audio through the headphones sounds great and can
get very loud (I typically cannot go above 58%), but audio through the
speakers can get tinny/distorted and is quiet at 100%. I believe this is
a known issue with the X1 Carbon's speakers and is probably unrelated to
the issue at hand, but I thought it is worth mentioning since there is
discussion in this thread about using the speaker's DAC for the
headphones instead of the headphone's DAC.

I applied the changes mentioned here [1], and the popping sounds in the
left-channel of my headphones appear to have stopped. I have been using
this video [2] to test before and after the changes due to its wide
range of audio and vocals (quiet, normal, and loud moments).


alsa-info: 
http://www.alsa-project.org/db/?f=d961cfbf429bc18b38ce8d1cf8e931482ba4a627

[1] https://forums.lenovo.com/t5/Linux-Discussion/X1-Carbon-Gen-6-weird-
audio-behaviour/m-p/4172468/highlight/true#M11520

[2] https://youtu.be/f2kesmAO8VU

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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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