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the problem. Please test the kernel and update this bug with the
results. If the problem is solved, change the tag 'verification-needed-
bionic' to 'verification-done-bionic'. If the problem still exists,
change the tag 'verification-needed-bionic' to 'verification-failed-

If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.

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** Tags added: verification-needed-bionic

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  Constant noise in the headphone on Lenovo X1 machines

Status in linux package in Ubuntu:
  Fix Committed
Status in linux source package in Bionic:
  Fix Committed
Status in linux source package in Cosmic:
  Fix Committed

Bug description:
  It is reported that there is constant noise on lenovo X1 machines, and after
  investigating, I found this issue will happen on all Lenovo machines with the
  codec alc285.

  According to Realtek's comment, the noise comes from PC peeb in, after
  disable this pin or disable the passthrough of this pin will fix the

  [Test Case]
  After applying this patch, we play sound on Lenovo P52, P72, X1 carbon and X1
  Yoda2, no noise anymore. And this patch is confirmed to work by many other
  users too (,

  [Regression Potential]
  Low. This patch only apply to several lenovo machines, and it is tested
  by many users already.

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