https://bugs.kde.org/show_bug.cgi?id=509669
Bug ID: 509669
Summary: Cursor image appears 'desynchronized' when it changes
Classification: Plasma
Product: kwin
Version First 6.4.90
Reported In:
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: wayland-generic
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
SUMMARY
When moving the mouse in a quick circular fashion over different types of UI
elements, when the mouse cursor image changes (i.e. from regular pointer to the
resize, text or hand cursor), it appears as though the cursor is "lagging" via
persistence of vision; the persisting 'changed' cursor appears too late for
example. This did not happen on 6.4, where it is always smooth no matter how
many times the cursor changes.
STEPS TO REPRODUCE
1. Log into a session
2. Open a Konsole window
3. Move the mouse in rapid circular motion so that the resulting 'circle'
borders on both the desktop and the Konsole window's borders to trigger the
resize cursor image
(or open a website with lots of text on it and similarly circle around the
mouse over the background and the text)
OBSERVED RESULT
Some images retained by persistence of vision appear 'laggy' and are not spaced
out evenly (especially visible at 120Hz+)
EXPECTED RESULT
All cursor images should always appear evenly spaced out when moving the mouse
SOFTWARE/OS VERSIONS
Operating System: Arch Linux
KDE Plasma Version: 6.4.90
KDE Frameworks Version: 6.18.0
Qt Version: 6.10.0
Kernel Version: 6.16.7-arch1-1 (64-bit)
Graphics Platform: Wayland
Processors: 20 × AMD Ryzen AI 9 365 w/ Radeon 880M
Memory: 32 GiB of RAM (27.2 GiB usable)
Graphics Processor: AMD Radeon 880M Graphics
ADDITIONAL INFORMATION
A high polling rate mouse is required(?) Unsure if this reproduces below
1000Hz. I did not enable overlay planes.
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