Fix AMD Stoney Ridge screen flickering under 4K resolution
Bug #1864005 reported by
Kai-Heng Feng
This bug affects 1 person
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
HWE Next |
Fix Released
|
Undecided
|
Unassigned | ||
linux (Ubuntu) |
Fix Released
|
Undecided
|
Unassigned | ||
Bionic |
Won't Fix
|
Undecided
|
Unassigned | ||
Disco |
Won't Fix
|
Undecided
|
Kamal Mostafa | ||
Eoan |
Fix Released
|
Undecided
|
Unassigned | ||
Focal |
Fix Released
|
Undecided
|
Unassigned |
Bug Description
[Impact]
Screen flickering/tearing when AMD Stoney Ridge outputs to 4K display.
[Fix]
Disable IOMMU on Stoney Ridge.
[Test]
Connect to 4K screen through DP or HDMI. Heavy flickering/tearing can be
observed.
The flickering/tearing is gone once the patch is applied.
[Regression Potential]
Low. This fix limits to one specific SoC.
According to AMD, IOMMU isn't enabled for this SoC under Windows.
So it's expected behavior.
CVE References
tags: | added: busan oem-priority originate-from-1852195 |
Changed in linux (Ubuntu Bionic): | |
status: | Incomplete → In Progress |
Changed in linux (Ubuntu Eoan): | |
status: | Incomplete → In Progress |
Changed in linux (Ubuntu Focal): | |
status: | Incomplete → In Progress |
Changed in linux (Ubuntu Eoan): | |
status: | In Progress → Fix Committed |
tags: |
added: verification-done-focal removed: verification-needed-focal |
Changed in linux (Ubuntu Disco): | |
status: | New → In Progress |
assignee: | nobody → Kamal Mostafa (kamalmostafa) |
tags: |
added: verification-done-eoan removed: verification-needed-eoan |
Changed in linux (Ubuntu Disco): | |
status: | Fix Committed → Won't Fix |
Changed in linux (Ubuntu Bionic): | |
status: | In Progress → Won't Fix |
Changed in hwe-next: | |
status: | New → Fix Released |
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This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:
apport-collect 1864005
and then change the status of the bug to 'Confirmed'.
If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.
This change has been made by an automated script, maintained by the Ubuntu Kernel Team.