** Changed in: linux (Ubuntu Groovy)
Status: Confirmed => Fix Committed
** Changed in: linux (Ubuntu Hirsute)
Status: Confirmed => Fix Committed
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https://bugs.launchpad.net/bugs/1925685
Title:
[SRU] Patch for flicker and glitching on common LCD display panels,
intel framebuffer
Status in HWE Next:
New
Status in linux package in Ubuntu:
Confirmed
Status in linux-oem-5.10 package in Ubuntu:
Invalid
Status in linux source package in Bionic:
Won't Fix
Status in linux-hwe-5.8 source package in Bionic:
Confirmed
Status in linux-oem-5.10 source package in Bionic:
Invalid
Status in linux source package in Focal:
Won't Fix
Status in linux-hwe-5.8 source package in Focal:
Confirmed
Status in linux-oem-5.10 source package in Focal:
Fix Committed
Status in linux source package in Groovy:
Fix Committed
Status in linux-hwe-5.8 source package in Groovy:
Confirmed
Status in linux-oem-5.10 source package in Groovy:
Invalid
Status in linux source package in Hirsute:
Fix Committed
Status in linux-hwe-5.8 source package in Hirsute:
Confirmed
Status in linux-oem-5.10 source package in Hirsute:
Invalid
Status in linux source package in Impish:
Confirmed
Status in linux-hwe-5.8 source package in Impish:
Confirmed
Status in linux-oem-5.10 source package in Impish:
Invalid
Bug description:
Filing this with my Kubuntu Focus (kfocus.org) OEM hat on:
[Impact]
We are having screen flickering and glitching issues with some of our
hardware upon wake from suspend. We have worked with our ODM to figure
out a fix for this. They had reported there were no issues when
running Windows on the same hardware. As such, we tested, and found
that this issue first began as a regression in kernel 5.0 (did not
exist in kernel 4.18 per our tests).
We identified a patch via
https://gitlab.freedesktop.org/drm/intel/-/issues/272 in which this
has been solved. Per our testing by recompiling the kernel, this
completely fixes our hardware issue. As of 4-21, this fix has been
merged into the Linux kernel per Timo Aaltonen, and will be included
in the kernel in the 5.13 release.
Our hardware ships with Kubuntu 20.04 LTS, which means the 5.13 kernel
will not see these machines, at least in the forseeable future. As
such, we request that this patch be added to the kernel. Per our
testing, this patch is straightforward to add and works flawlessly.
The patch that works best was created in collaboration with Kai-Heng
Feng, is attached to this bug report, and can be found here:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1925685/+attachment/5491421/+files
/drm-intel-both.patch
Until this is fixed, we have a whole batch of hardware we cannot sell,
so, as an OEM, this is a high priority.
[Test Plan]
* Install Kubuntu on an affected Kubuntu Focus M2 computer (not in
the hands of customers at this time)
* Notice screen glitching/flickering after wake-from-suspend.
* Install kernel compiled with the attached patch. Boot from patched
kernel.
* Suspend laptop, resume. No glitches.
[Where problems could occur]
* Although this solves the problem for us and has been confirmed to
work with the Intel developers that developed this patch, it could
cause another display type to have problems. This is unlikely as it
has been vetted by Intel and by the mainline Linux kernel developers.
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