Bug 449291 - zoom effect has 2 mouse cursors visible
Summary: zoom effect has 2 mouse cursors visible
Status: CONFIRMED
Alias: None
Product: kwin
Classification: Plasma
Component: effects-various (show other bugs)
Version: 6.3.0
Platform: Neon Linux
: NOR normal
Target Milestone: ---
Assignee: KWin default assignee
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2022-01-28 14:19 UTC by Mariusz Libera
Modified: 2025-02-17 14:28 UTC (History)
3 users (show)

See Also:
Latest Commit:
Version Fixed In:
Sentry Crash Report:

Attachments
screenshot showing the problem (1.30 MB, video/webm)
2025-02-16 14:40 UTC, Oded Arbel 		Details
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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.