** Summary changed:

- Fractional scaling has significant visible refreshes on a 4k display
+ Fractional scaling has significant visible tearing on a 4k display

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https://bugs.launchpad.net/bugs/1846398

Title:
  Fractional scaling has significant visible tearing on a 4k display

Status in X.Org X server:
  New
Status in gnome-shell package in Ubuntu:
  Confirmed
Status in mutter package in Ubuntu:
  Confirmed
Status in xorg-server package in Ubuntu:
  Confirmed

Bug description:
  On my laptop, fractional scaling seems fine, including watching a
  YouTube video. It has a quad HD display.

  Enabling fractional scaling on my desktop which is attached to a
  single 4k display, fractional scaling isn't usable. The video appears
  to be constantly refreshing and not using the same acceleration as if
  I just run at 100% or 200%.

  ProblemType: Bug
  DistroRelease: Ubuntu 19.10
  Package: gnome-shell 3.34.0-1ubuntu1
  ProcVersionSignature: Ubuntu 5.3.0-13.14-generic 5.3.0
  Uname: Linux 5.3.0-13-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.11-0ubuntu7
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Wed Oct  2 14:23:33 2019
  DisplayManager: gdm3
  InstallationDate: Installed on 2018-07-24 (435 days ago)
  InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 
(20180724)
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  RelatedPackageVersions: mutter-common 3.34.0-3ubuntu1
  SourcePackage: gnome-shell
  UpgradeStatus: Upgraded to eoan on 2019-07-19 (74 days ago)

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