** Also affects: linux (Ubuntu Xenial)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Xenial)
Importance: Undecided => High
** Changed in: linux (Ubuntu Xenial)
Status: New => Triaged
** Changed in: linux (Ubuntu Xenial)
Assignee: (unassigned) => Timo Aaltonen (tjaalton)
** Changed in: linux (Ubuntu)
Importance: High => Undecided
** Changed in: linux (Ubuntu)
Status: Triaged => Invalid
** Changed in: linux (Ubuntu)
Assignee: Timo Aaltonen (tjaalton) => (unassigned)
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https://bugs.launchpad.net/bugs/1770565
Title:
[i915_bpo] Fix flickering issue after panel change
Status in linux package in Ubuntu:
Invalid
Status in linux source package in Xenial:
Triaged
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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