Clipboard / Inputs sometime stop working/freeze when copy/paste plain text between Kubuntu host and Kubuntu QEMU VM

Bug #1922942 reported by Dan on 2021-04-07
This bug affects 4 people
Affects Status Importance Assigned to Milestone
virt-manager (Ubuntu)

Bug Description

Dear Canonical / Ubuntu team,

I'd like to report a bug that I found during Ubuntu Testing Week in Kubuntu.

I have a problem that you can easily reproduce like this:

* Download 21.04 Kubuntu ISO (I downloaded it on 2021-04-07 and the ISO had date 2021-03-31)
* Install (or run live)
* Install QEMU and virt-manager
* Install another Kubuntu as a VM
* Make sure that spice-vdagent in the VM is installed and that spice service is running
* Copy paste text between VM and host to make sure Spice is working

Reproduce bug:
* Start copying and pasting Ctrl+c/Ctrl+v small amount of plain text - I just tried Konsole and Kate
* After some number of trials your keyboard on host system will hang for approx 30 seconds - you can't paste or type anything for approx. 30 seconds
* This will happen even when you're copying within Kate on the host (not just between VM and host)

* Close virt-manager (not very good workaround since then you can't use the VM)

Please feel free to ask questions.

Thank you Canonical people for giving us chance to test Ubuntu during the Testing Week.

Kind regards,


ProblemType: Bug
DistroRelease: Ubuntu 21.04
Package: virt-manager 1:3.2.0-3
ProcVersionSignature: Ubuntu 5.11.0-13.14-generic 5.11.7
Uname: Linux 5.11.0-13-generic x86_64
ApportVersion: 2.20.11-0ubuntu61
Architecture: amd64
CasperMD5CheckResult: pass
CasperVersion: 1.461
CurrentDesktop: KDE
Date: Wed Apr 7 17:15:35 2021
LiveMediaBuild: Kubuntu 21.04 "Hirsute Hippo" - Beta amd64 (20210331.1)
PackageArchitecture: all
SourcePackage: virt-manager
UpgradeStatus: No upgrade log present (probably fresh install)

Dan (danmuir) wrote :
Launchpad Janitor (janitor) wrote :

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

Changed in virt-manager (Ubuntu):
status: New → Confirmed
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