Sounds like it might end up being the same problem as bug 1748871. Even
though the appearance of the flicker seems different.

** Summary changed:

- flicker after GDM blank screen with wayland
+ Flickering screen with ultra-wide monitor in Wayland mode

** Package changed: gnome-shell (Ubuntu) => mutter (Ubuntu)

** Changed in: mutter (Ubuntu)
       Status: Incomplete => New

** Changed in: mutter (Ubuntu)
   Importance: Undecided => High

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  Flickering screen with ultra-wide monitor in Wayland mode

Status in mutter package in Ubuntu:

Bug description:
  1. leave computer until gnome-shell blanks the screen (monitor goes to sleep)
  2. clear GDM screen by swiping up.

  There is a video flicker now when I interact with computer.
  Usually small, but can cover many different UI elements.

  This does not happen if I use the X backend instead of wayland.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: gnome-shell 3.26.2-0ubuntu0.1
  ProcVersionSignature: Ubuntu 4.13.0-32.35-generic 4.13.13
  Uname: Linux 4.13.0-32-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.20.7-0ubuntu3.7
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Fri Feb 16 16:07:12 2018
  DisplayManager: gdm3
   b'' b'enabled-extensions' 
'', '', 
'', '']"
   b'' b'enable-hot-corners' b'true'
   b'' b'favorite-apps' b"['googleinbox.desktop', 
'googlecalendar.desktop', 'org.gnome.Nautilus.desktop', 'firefox.desktop']"
   b'org.gnome.desktop.interface' b'gtk-im-module' b"'gtk-im-context-simple'"
   b'org.gnome.desktop.interface' b'monospace-font-name' b"'Ubuntu Mono 11'"
  InstallationDate: Installed on 2018-01-05 (42 days ago)
  InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412)
  SourcePackage: gnome-shell
  UpgradeStatus: Upgraded to artful on 2018-01-05 (42 days ago)

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