I used X11 more often lately and faced the same bug, so it is not actually a Wayland only problem.
It seems the flash occurs only in the evening. So my guess is that the bug is related to the Night Mode of Gnome that randomly deactivates itself for one frame. ** Summary changed: - [regression] Full screen white flash from time to time with Wayland + [regression] Full screen white flash from time to time (Wayland and X11) -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-shell in Ubuntu. https://bugs.launchpad.net/bugs/1765141 Title: [regression] Full screen white flash from time to time (Wayland and X11) Status in gnome-shell package in Ubuntu: New Status in mutter package in Ubuntu: New Bug description: I am using Ubuntu 18.04 with gnome shell on Wayland. From time to time, maybe every one or two hours, the desktop becomes white for a fraction of second. I guess it is just one frame (1/60 of second). It looks like a full filled rectangle of white color but it is so fast I cannot verify to be sure (the only solution I'm thinking of would be to have a fast recording camera pointed to my display). I did not experience that problem on Ubuntu 17.10 with Wayland. ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: gnome-shell 3.28.0-0ubuntu5 ProcVersionSignature: Ubuntu 4.15.0-15.16-generic 4.15.15 Uname: Linux 4.15.0-15-generic x86_64 ApportVersion: 2.20.9-0ubuntu5 Architecture: amd64 CurrentDesktop: ubuntu:GNOME Date: Wed Apr 18 19:26:15 2018 DisplayManager: gdm3 InstallationDate: Installed on 2018-04-07 (11 days ago) InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Alpha amd64 (20180403) ProcEnviron: TERM=xterm-256color PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=fr_FR.UTF-8 SHELL=/bin/bash SourcePackage: gnome-shell UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1765141/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
