For comment#8, I can reproduce the former parts,  but "I start hearing
noise reminiscent of cheap soundcards..." can't be reproduced, there is
no noise on my machine (x1 carbon).

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  click/pop noise in the headphone on several lenovo laptops

Status in linux package in Ubuntu:
  Fix Committed

Bug description:
  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.

  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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