Note: This is a public test instance of Red Hat Bugzilla. The data contained within is a snapshot of the live data so any changes you make will not be reflected in the production Bugzilla. Email is disabled so feel free to test any aspect of the site that you want. File any problems you find or give feedback at
Bug 2063969 - Real cursor position is slightly offset from displayed position on Wayland in virtual machine (kde spin)
Summary: Real cursor position is slightly offset from displayed position on Wayland in...
Alias: None
Product: Fedora
Classification: Fedora
Component: kwin
Version: 36
Hardware: Unspecified
OS: Unspecified
Target Milestone: ---
Assignee: Daniel Vrátil
QA Contact: Fedora Extras Quality Assurance
Depends On:
Blocks: F36BetaFreezeException F36FinalBlocker
TreeView+ depends on / blocked
Reported: 2022-03-14 18:44 UTC by Geraldo Simião
Modified: 2022-03-24 00:56 UTC (History)
9 users (show)

Fixed In Version: kwin-5.24.3-3.fc36
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Last Closed: 2022-03-24 00:56:48 UTC
Type: Bug

Attachments (Terms of Use)
Version-Release number of selected components (deleted)
2022-03-14 18:44 UTC, Geraldo Simião
no flags Details
video of a plasma-wayland session bug on F36 KDE (deleted)
2022-03-14 18:45 UTC, Geraldo Simião
no flags Details
screencast with new updates (deleted)
2022-03-22 02:27 UTC, Geraldo Simião
no flags Details
at Fedora-KDE-Live-x86_64-36_Beta-1.4.iso it seems fixed (deleted)
2022-03-23 02:28 UTC, Geraldo Simião
no flags Details

System ID Private Priority Status Summary Last Updated
KDE Software Compilation 427060 0 NOR CONFIRMED Cursor "hit box" is offset under Wayland on VMs (VMWare, VirtualBox, ...) 2022-03-15 16:23:18 UTC

Description Geraldo Simião 2022-03-14 18:44:22 UTC
Created attachment 1865913 [details]
Version-Release number of selected components

Description of problem:
Same behavior as see on a F35 ticket last year: [RHBZ ticket 2011066](
"If you boot a KDE live image in a windowed qemu VM using qxl or virtio graphics (which are the two most recent default settings in qemu) and log into Plasma on Wayland (the bug does not affect Plasma on X11), the real cursor position will be slightly offset from where it's drawn. For me the real position is always slightly above and to the left of the 'apparent' position."

How reproducible:

Steps to Reproduce:
1.Install a KVM-Qemu-VirtManager VM qith Fedora 36 KDE spin
2.Open a plasma-wayland session
3. Open any window and try to move it

Actual results:
Mouse pointer offset
(I'll upload a video from the behavior)

Expected results:
Pointer actually working (clicking) at the right places

Comment 1 Geraldo Simião 2022-03-14 18:45:45 UTC
Created attachment 1865914 [details]
video of a plasma-wayland session bug on F36 KDE

VM is BIOS and using QXL video driver

Comment 2 Geraldo Simião 2022-03-14 18:49:25 UTC
It seems upstream is tracking that here. Thanks Adam Williamson.

Comment 3 Geraldo Simião 2022-03-14 23:38:57 UTC
Since 2009304 and 2011066 was accepted as blocker at F35, I'm proposing this as a blocker too.

Comment 4 Kamil Páral 2022-03-18 13:17:02 UTC
Geraldo, could you please test whether removing spice-vdagent from the VM again serves as a workaround for this bug? Thanks!

Comment 5 Kamil Páral 2022-03-18 14:14:52 UTC
To answer myself - removing spice-vdagent doesn't help. I also tried putting KWIN_FORCE_SW_CURSOR=1 into /etc/environment, and then you see two cursors (host and guest) and you can see the actual offset between them. The offset is largest and easiest to detect, when you test this in the `drawing` app, probably due to the fact that it sets its own "cross" cursor.

Comment 6 Adam Williamson 2022-03-21 16:33:57 UTC
also proposing as Beta FE. there's a patch upstream I'll backport shortly.

Comment 7 Geoffrey Marr 2022-03-21 18:10:23 UTC
Discussed during the 2022-03-21 blocker review meeting: [0]

The decision to classify this bug as both an "AcceptedBlocker (Final)" and an "AcceptedFreezeException (Beta)" was made as this is a significant problem in using virtual machines with a release-blocking desktop; we accepted an identical bug as blocker for F35 Final. As it will affect the KDE live we would also like to fix it in Beta if possible.


Comment 8 Fedora Update System 2022-03-21 19:10:00 UTC
FEDORA-2022-6ae069bd8a has been submitted as an update to Fedora 36.

Comment 9 Geraldo Simião 2022-03-22 02:27:39 UTC
Created attachment 1867341 [details]
screencast with new updates

With new updates (kwin-5.24.3-3.fc36) the offset looks a little better (it seems no horiszontal offset anymore) but stil some vertical to the right.

Comment 10 Kamil Páral 2022-03-22 08:52:16 UTC
In my case, the offset was fixed perfectly by the update.

Comment 11 Geraldo Simião 2022-03-23 02:28:54 UTC
Created attachment 1867644 [details]
at Fedora-KDE-Live-x86_64-36_Beta-1.4.iso it seems fixed

Comment 12 Fedora Update System 2022-03-24 00:56:48 UTC
FEDORA-2022-6ae069bd8a has been pushed to the Fedora 36 stable repository.
If problem still persists, please make note of it in this bug report.

Note You need to log in before you can comment on or make changes to this bug.