Bug 510144

Summary: Mouse pointer keeps stopping for a few seconds with multiple windows open and 1000Hz mouse polling rate
Product: [Plasma] kwin Reporter: mf.finland707
Component: inputAssignee: KWin default assignee <kwin-bugs-null>
Status: RESOLVED WORKSFORME    
Severity: major CC: akselmo, duha.bugs, kdedev, nate
Priority: NOR Keywords: efficiency-and-performance
Version First Reported In: 6.4.5   
Target Milestone: ---   
Platform: Arch Linux   
OS: Linux   
See Also: https://bugs.kde.org/show_bug.cgi?id=510046
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:
Attachments: A screenshot of the top command while the bug is happening

Description mf.finland707 2025-10-01 21:42:58 UTC
SUMMARY
Sometimes when moving my mouse, the cursor keeps freezing for a few seconds.

STEPS TO REPRODUCE
1. Use a Logitech G305 mouse.
2. Open a few windows

OBSERVED RESULT
The pointer goes stuck for a few seconds periodically as long as there are too many windows open.

EXPECTED RESULT
The pointer should not get stuck.

SOFTWARE/OS VERSIONS
Operating System: Arch Linux 
KDE Plasma Version: 6.4.5
KDE Frameworks Version: 6.18.0
Qt Version: 6.9.2
Kernel Version: 6.16.8-arch3-1 (64-bit)
Graphics Platform: Wayland
Processors: 12 ร— AMD Ryzen 5 5500
Memory: 16 GiB of RAM (15.5 GiB usable)
Graphics Processor: AMD Radeon RX 6600

ADDITIONAL INFORMATION
180Hz and 75Hz monitors
The bug could only need a 1000Hz mouse and not the specific model.
Comment 1 TraceyC 2025-10-02 15:12:24 UTC
Can you give us a screenshot of `top` or the tool of your choice when the bug is happening?

I've also seen this on 6.4.5 with a Logitech G502 Lightspeed mouse, but had chalked it up to an app / electron since Obsidian Notes was always at the top of the process list, and the stuttering would stop happening if I closed it.
Comment 2 mf.finland707 2025-10-07 09:36:49 UTC
(In reply to TraceyC from comment #1)
> Can you give us a screenshot of `top` or the tool of your choice when the
> bug is happening?
> 
> I've also seen this on 6.4.5 with a Logitech G502 Lightspeed mouse, but had
> chalked it up to an app / electron since Obsidian Notes was always at the
> top of the process list, and the stuttering would stop happening if I closed
> it.

I haven't had this issue recently for whatever reason, maybe a system upgrade fixed the issue. But if it happens again I will show the output of the `top` command.
Comment 3 TraceyC 2025-10-08 16:09:56 UTC
Thanks for the update. I'll leave this in NEEDSINFO so it will remind us in 15 days. If the problem doesn't happen again, you can let the issue auto close in 30 days.
Comment 4 mf.finland707 2025-10-08 20:51:39 UTC
Created attachment 185616 [details]
A screenshot of the top command while the bug is happening
Comment 5 mf.finland707 2025-10-08 20:54:13 UTC
After opening davinci resolve, a video editor, the bug started to happen again. I have added a screenshot of the `top` command as an attachment.
Comment 6 TraceyC 2025-10-09 16:02:39 UTC
Thanks for the screenshot, that's helpful. I see the process "GUI Thread" is using 101.0% CPU. It's possible this is tied to the performance of Davinci Resolve. Do you see this with any other application or just Resolve?
Comment 7 Bug Janitor Service 2025-10-24 03:47:21 UTC
๐Ÿ›๐Ÿงน โš ๏ธ This bug has been in NEEDSINFO status with no change for at least 15 days. Please provide the requested information, then set the bug status to REPORTED. If there is no change for at least 30 days, it will be automatically closed as RESOLVED WORKSFORME.

For more information about our bug triaging procedures, please read https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging.

Thank you for helping us make KDE software even better for everyone!
Comment 8 mf.finland707 2025-10-26 10:35:41 UTC
I have no longer had this issue at all, even in davinci resolve. I did do multiple system upgrades since reporting this bug, so an update might've fixed it for me.
Comment 9 Bug Janitor Service 2025-11-10 03:46:57 UTC
๐Ÿ›๐Ÿงน โš ๏ธ This bug has been in NEEDSINFO status with no change for at least 15 days. Please provide the requested information, then set the bug status to REPORTED. If there is no change for at least 30 days, it will be automatically closed as RESOLVED WORKSFORME.

For more information about our bug triaging procedures, please read https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging.

Thank you for helping us make KDE software even better for everyone!