Public bug reported:
[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.
** Affects: hwe-next
Importance: Undecided
Status: New
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Affects: linux (Ubuntu Bionic)
Importance: Undecided
Status: New
** Affects: linux (Ubuntu Eoan)
Importance: Undecided
Status: New
** Affects: linux (Ubuntu Focal)
Importance: Undecided
Status: New
** Tags: busan oem-priority originate-from-1852195
** Also affects: linux (Ubuntu Bionic)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Focal)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Eoan)
Importance: Undecided
Status: New
** Tags added: busan oem-priority originate-from-1852195
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https://bugs.launchpad.net/bugs/1864005
Title:
Fix AMD Stoney Ridge screen flickering under 4K resolution
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