ACK / APPLIED[F/Unstable]: [SRU] [B/E/F/Unstable] [PATCH 0/1] Fix AMD Stoney Ridge screen flickering under 4K resolution

[Seth Forshee]

On Thu, Feb 20, 2020 at 04:37:02PM +0800, Kai-Heng Feng wrote:
> BugLink: https://bugs.launchpad.net/bugs/1864005
> 
> [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.

Acked-by: Seth Forshee <seth.forshee at canonical.com>

Applied to focal/master-next and unstable/master, thanks!