[i915_bpo] Fix flickering issue after panel change
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
HWE Next |
Fix Released
|
Undecided
|
Unassigned | ||
linux (Ubuntu) |
Invalid
|
Undecided
|
Unassigned | ||
Xenial |
Fix Released
|
High
|
Timo Aaltonen |
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.
Changed in linux (Ubuntu): | |
assignee: | nobody → Timo Aaltonen (tjaalton) |
importance: | Undecided → High |
status: | New → Triaged |
description: | updated |
Changed in linux (Ubuntu Xenial): | |
assignee: | nobody → Timo Aaltonen (tjaalton) |
importance: | Undecided → High |
status: | New → Triaged |
Changed in linux (Ubuntu): | |
assignee: | Timo Aaltonen (tjaalton) → nobody |
importance: | High → Undecided |
status: | Triaged → Invalid |
tags: | added: originate-from-1747439 somerville |
Changed in linux (Ubuntu Xenial): | |
status: | Triaged → Fix Committed |
tags: |
added: verification-done-xenial removed: verification-needed-xenial |
Changed in hwe-next: | |
status: | New → Fix Released |
No regression was found by testing Dell Inspiron 3179[1] and Dell Latitude 3480[2] with their OEM images and this kernel deb https:/ /aaltoset. kapsi.fi/ lp1747439/
[1] https:/ /certification. ubuntu. com/hardware/ 201605- 22333/ /certification. ubuntu. com/hardware/ 201612- 25305/
[2] https:/