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[Anthony Wong <anthony.wong@xxxxxxxxxx>]

** Changed in: hwe-next
       Status: New => Fix Released

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https://bugs.launchpad.net/bugs/1770565

Title:
  [i915_bpo] Fix flickering issue after panel change

Status in HWE Next:
  Fix Released
Status in linux package in Ubuntu:
  Invalid
Status in linux source package in Xenial:
  Fix Released

Bug description:
  [Impact]
  A certain OEM laptop changed the panel type/vendor, and the change regressed the driver causing a flickering image. The ODM has tools to measure various values of the driver/panel combination, and determined that some voltage levels were way too low to pass the spec. The process to bisect the commits took weeks, so while it's technically possible that this issue was fixed by a single commit (drm/i915: Ignore OpRegion panel type except on select machines), we've also kept another 10 commits which upstream thought should help (and did, they improved the measured values but not enough).

  So, this backport carries all 11 commits from 4.8/4.9 that the ODM
  verified to pass the tests.

  [Test case]
  Needs to be tested with the ODM tools to be sure.

  [Regression potential]
  There is some, but apart from the necessary refactoring the rest are bugfixes to match the HW specs, so this should in fact fix a lot more than just this certain machine.

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