** Changed in: hwe-next
Status: New => Fix Released
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Title:
[i915_bpo] Fix flickering issue after panel change
Status in
file a new bug, test mainline kernels starting from 4.8 and up
http://kernel.ubuntu.com/~kernel-ppa/mainline/
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Title:
[i915_bpo]
although, your issue can't be the result of this backport, because T440s
has a haswell (gen7.5) gpu, i915_bpo is used only on gen9 gpus
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Since installing this kernel, I see instant screen garbage or blanking
(everything but the cursor), when attaching / removing a second / third
screen on My Lenovo Thinkpad T440s.
Older kernels do not suffer these problems. A restart of lightdm makes
the problems go away and makes a second screen
This bug was fixed in the package linux - 4.4.0-128.154
---
linux (4.4.0-128.154) xenial; urgency=medium
* linux: 4.4.0-128.154 -proposed tracker (LP: #1772960)
* CVE-2018-3639 (x86)
- x86/cpu: Make alternative_msr_write work for 32-bit code
- x86/bugs: Fix the
Need special instrument to verify this issue.
ODM verified the following patch in their lab and got positive test result.
UBUNTU: Ubuntu-4.4.0-128.154
commit 2d19b35bc9773eb4de54b6104bfec79814f930db
Author: Ville Syrjälä
Date: Fri May 11 08:21:00 2018 +0200
drm/i915: Ignore OpRegion panel
** Tags removed: verification-needed-xenial
** Tags added: verification-done-xenial
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Title:
[i915_bpo] Fix flickering issue after
This bug is awaiting verification that the kernel in -proposed solves
the problem. Please test the kernel and update this bug with the
results. If the problem is solved, change the tag 'verification-needed-
xenial' to 'verification-done-xenial'. If the problem still exists,
change the tag
** Changed in: linux (Ubuntu Xenial)
Status: Triaged => Fix Committed
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Title:
[i915_bpo] Fix flickering issue after panel
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/
[2] https://certification.ubuntu.com/hardware/201612-25305/
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** Tags added: originate-from-1747439 somerville
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Title:
[i915_bpo] Fix flickering issue after panel change
Status in HWE Next:
** 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
** Description changed:
- 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
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