Public bug reported:

I've only noticed these glitches when my Framework 13 is connected to a Dell 
WD19TB Thunderbolt Dock over USB-C. It doesn't matter whether the Framework 
panel is closed or open.
 
When a movement reminder or eyesight break is announced, the screen will 
sometimes flash bright white, then stagger down to a dimmer screen brightness 
level with no smoothing. It's visually very jarring.

Additionally, the cursor will start ghosting.

ProblemType: Bug
DistroRelease: Ubuntu 26.10
Package: gnome-shell 51~beta-0ubuntu1
ProcVersionSignature: Ubuntu 7.2.0-5.5-generic 7.2.0
Uname: Linux 7.2.0-5-generic x86_64
NonfreeKernelModules: zfs
ApportVersion: 2.36.0-0ubuntu1
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Mon Sep  7 07:18:45 2026
DisplayManager: gdm3
InstallationDate: Installed on 2026-04-14 (145 days ago)
InstallationMedia: Ubuntu 24.04.4 LTS "Noble Numbat" - Release amd64 (20260210)
SourcePackage: gnome-shell
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: gnome-shell (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug stonking third-party-packages wayland-session

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https://bugs.launchpad.net/bugs/2166642

Title:
  Wellbeing reminders cause various visual glitches

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