** Also affects: linux (Ubuntu Disco)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Disco)
Status: New => In Progress
** Changed in: linux (Ubuntu Disco)
Assignee: (unassigned) => Kamal Mostafa (kamalmostafa)
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https://bugs.launchpad.net/bugs/1864005
Title:
Fix AMD Stoney Ridge screen flickering under 4K resolution
Status in HWE Next:
New
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Bionic:
In Progress
Status in linux source package in Disco:
In Progress
Status in linux source package in Eoan:
Fix Committed
Status in linux source package in Focal:
Fix Released
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.
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