input is freezing when you have QEMU-KVM / virt-manager window opened

[Karel Trutla]

When I install Kubuntu 20.04 and then VM with another Kubuntu 20.04 (virt-manager) then keyboard randomly stop responding and Ctrl+c and Ctrl+v doesn't always work. If I close virt-manager / shutdown the VM then everything works fine again.

Steps to Reproduce:
1. install Kubuntu 20.04
2. install QEMU-KVM and virt-manager
3. install Kubuntu 20.04 as a VM
4. start copying and pasting text inside VM / in the host / between host and VM (spice has to be installed)
5. you'll see random freezes of your keyboard
6. Ctrl+c and Ctrl+v will work 80% time (very irritating)
7. close virt-manager and Ctrl+c and Ctrl+v will work just fine and no more keyboard freezes

In other words, it is not possible to use virt-manager unless you use VM with no desktop.

Thank you. Please ask if you need more details ;-).

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: plasma-desktop 4:5.18.3-0ubuntu1
ProcVersionSignature: Ubuntu 5.4.0-21.25-generic 5.4.27
Uname: Linux 5.4.0-21-generic x86_64
ApportVersion: 2.20.11-0ubuntu21
Architecture: amd64
CurrentDesktop: KDE
Date: Sun Apr 12 14:04:47 2020
InstallationDate: Installed on 2020-04-12 (0 days ago)
InstallationMedia: Kubuntu 20.04 LTS "Focal Fossa" - Beta amd64 (20200401)
SourcePackage: plasma-desktop
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Pawel Por (porparek)]

I have similar issue. During installation of guest Ubuntu 20.04 the input sometimes hangs.
Host: Xubuntu 18.04
4.15.0-111-generic #112-Ubuntu SMP Thu Jul 9 20:32:34 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
qemu-kvm 1:2.11+dfsg-1ubuntu7.28
gir1.2-libvirt-glib-1.0:amd64 1.0.0-1
libvirt-* 4.0.0-1ubuntu8.17

Guest: Ubuntu 20.04

[Scarlett Gately Moore (scarlettmoore)]

This bug is very old, if it is still an issue please update the bug with information from a supported release.