Ant war on primary laptop screen after attaching an external monitor and switching it on and off

[Karl Kastner]

On Lenovo E14 Gen 2 kernel 5.13.0-22 exhibits multiple bugs, one of them is that the primary screen shows white noise (ant war) after attaching an external monitor and switching it on and oft This cannot be solved by switching to tty or restarting the display manager, reboot necessary

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: linux-image-5.13.0-22-generic 5.13.0-22.22~20.04.1
ProcVersionSignature: Ubuntu 5.13.0-22.22~20.04.1-generic 5.13.19
Uname: Linux 5.13.0-22-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu27.21
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Sat Feb 12 16:34:08 2022
InstallationDate: Installed on 2015-11-05 (2291 days ago)
InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
SourcePackage: linux-signed-hwe-5.13
UpgradeStatus: Upgraded to focal on 2020-09-10 (520 days ago)
modified.conffile..etc.apport.crashdb.conf: [modified]
mtime.conffile..etc.apport.crashdb.conf: 2019-03-07T14:28:39.455024