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** Tags added: verification-done-focal

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You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux-oem-5.6 in Ubuntu.
https://bugs.launchpad.net/bugs/1899586

Title:
  Fix broken MSI interrupt after HDA controller was suspended

Status in HWE Next:
  New
Status in linux-oem-5.6 package in Ubuntu:
  Invalid
Status in linux-oem-5.6 source package in Focal:
  Fix Committed

Bug description:
  [Impact]
  After HDA controller gets suspended and resumed, no MSI interrupt raised
  when plugging headset to the audio jack.

  [Fix]
  Power up the Realtek codec when HDA controller runtime resumes.

  [Test]
  1) Make sure both codec and HDA controller are runtime suspended.
  2) Runtime resume the HDA controller without runtime resume the codec.
  3) Plug a headset and see if the system can detect anything.

  With the fix applied, we can see azx_interrupt() is working again by
  using ftrace.

  [Regression Potential]
  If there's any system that is not affected by this issue, runtime-resume
  the HDA controller will take a slightly longer time. It's rather
  unlikely, since _all_ systems with Realtek codec we tested have this
  issue, regardless of AMD or Intel.

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