The two methods appear to do the same, except hda-verb applies the
change when run and the other method at the time the hda kernel module
is loaded.  You can run hda-verb at boot instead, but the other method
looks cleaner to me, as it applies the fix when the hardware is
configured by the driver.  I believe this fix can also be added to the
driver itself.

As I described above[0], after Hui Wang fixed this bug here that we're
commenting on[1], I started to hear noise in headphones.  This is not
occasional crackling sound, this is constant annoying noise.  Not every
gen6 Carbon has this issue, apparently.  This fixes the issue.



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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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