Bug 449291

Summary:	zoom effect has 2 mouse cursors visible
Product:	[Plasma] kwin	Reporter:	Mariusz Libera <mariusz.libera>
Component:	effects-various	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	CONFIRMED ---
Severity:	normal	CC:	ahiemstra, nate, oded
Priority:	NOR
Version First Reported In:	6.3.0
Target Milestone:	---
Platform:	Neon
OS:	Linux
Latest Commit:		Version Fixed In:
Sentry Crash Report:
Attachments:	screenshot showing the problem

Description Mariusz Libera 2022-01-28 14:19:40 UTC

Activate 'Zoom' effect. There are 2 mouse cursors. The more you zoom in - the further appart they are.

Operating System: Arch Linux
KDE Plasma Version: 5.23.90
KDE Frameworks Version: 5.90.0
Qt Version: 5.15.2
Kernel Version: 5.16.3-arch1-1 (64-bit)
Graphics Platform: X11
Processors: 8 × Intel® Core™ i7-8550U CPU @ 1.80GHz
Memory: 19.3 GiB of RAM
Graphics Processor: Mesa Intel® UHD Graphics 620

Comment 1 Nate Graham 2022-01-28 19:55:14 UTC

Cannot reproduce on Wayland.

Comment 2 Mariusz Libera 2022-08-20 14:53:22 UTC

Still an issue in plasma 5.25.4.
Here is a screen recording for illustration: https://streamable.com/wko1bz

Comment 3 Mariusz Libera 2022-10-15 13:30:57 UTC

I still had this issue with 5.26, but then I tested a fresh user account and couldn't reproduce. So I started looking at the config files and ~/.config/kwinrc had two sections related to zoom effect - after deleting those and rebooting this issue finally went away.

Comment 4 Oded Arbel 2025-02-16 14:39:47 UTC

I can reproduce with Plasma 6.3 on Neon - when the zoom effect is set with "Mouse pointer: Keep" and "Mouse tracking: Proportional". No other setting reproduces the issue.

A screencast will be attached shortly.

Operating System: KDE neon Testing Edition
KDE Plasma Version: 6.3.0
KDE Frameworks Version: 6.11.0
Qt Version: 6.8.2
Kernel Version: 6.11.0-17-generic (64-bit)
Graphics Platform: Wayland
Processors: 20 × 12th Gen Intel® Core™ i7-12700H
Memory: 31.0 GiB of RAM
Graphics Processor: Intel® Graphics

Comment 5 Oded Arbel 2025-02-16 14:40:06 UTC

Created attachment 178438 [details]
screenshot showing the problem

Comment 6 Arjen Hiemstra 2025-02-17 14:28:58 UTC

I can confirm this happens when setting "keep" while KWin's software cursor is enabled. It's tricky to solve because the Zoom effect scales the entire image of the output and doesn't ignore the cursor. Fixing it requires a fair amount of work.