Please try logging into 'Ubuntu' instead of 'Ubuntu on Wayland' and tell us if that has the same issue. Please also then run:
lspci -kv > lspci.txt xrandr --verbose > xrandr.txt journalctl -b0 > journal.txt and attach the resulting text files here. ** Changed in: mutter (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to mutter in Ubuntu. https://bugs.launchpad.net/bugs/1905270 Title: On any external monitors, wayland session has a white block on most part of the screen. Status in Mutter: Unknown Status in mutter package in Ubuntu: Incomplete Bug description: on any external monitors, wayland session has a white block on most part of the screen. ProblemType: Bug DistroRelease: Ubuntu 20.10 Package: mutter 3.38.1-1ubuntu1 ProcVersionSignature: Ubuntu 5.8.0-29.31-generic 5.8.14 Uname: Linux 5.8.0-29-generic x86_64 ApportVersion: 2.20.11-0ubuntu50.1 Architecture: amd64 CasperMD5CheckResult: skip CurrentDesktop: ubuntu:GNOME Date: Mon Nov 23 20:16:15 2020 InstallationDate: Installed on 2020-09-16 (67 days ago) InstallationMedia: Ubuntu 20.10 "Groovy Gorilla" - Alpha amd64 (20200910) SourcePackage: mutter UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/mutter/+bug/1905270/+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