Bug 508965

Summary:	Mouse acceleration profile changes when upgrading from X11 to Wayland
Product:	[Applications] systemsettings	Reporter:	Alexander Potashev <aspotashev>
Component:	kcm_mouse	Assignee:	Plasma Bugs List <plasma-bugs-null>
Status:	RESOLVED FIXED
Severity:	normal	CC:	bizyaev, duha.bugs, eugene.savitsky, natalie_clarius, nate
Priority:	NOR
Version First Reported In:	6.4.1
Target Milestone:	---
Platform:	Fedora RPMs
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:
Attachments:	screenshot ru_RU X11 screenshot ru_RU Wayland

Description Alexander Potashev 2025-08-31 10:03:25 UTC

SUMMARY
Mouse acceleration profile changes when upgrading from X11 to Wayland.

The problem is two-fold:
 1. Switching from X11 to Wayland isn't transparent for the user: They will notice that mouse acceleration profile is different, although they didn't touch any settings.
 2. As described in https://bugs.kde.org/show_bug.cgi?id=464868#c24, the current Mouse KCM doesn't provide settings to manually apply the same acceleration profile that was used in X11, at least if they were as follows in Mouse KCM on X11:
   * Pointer speed: 0.20
   * Pointer acceleration: Enabled (checkbox ticked).


SOFTWARE/OS VERSIONS
Operating System: Fedora Linux 41
KDE Plasma Version: 6.4.1
KDE Frameworks Version: 6.15.0
Qt Version: 6.8.3
Kernel Version: 6.15.4-100.fc41.x86_64 (64-bit)
Graphics Platform: X11
Processors: 8 × Intel® Core™ i7-6700HQ CPU @ 2.60GHz
Memory: 16 ГиБ of RAM (15.4 ГиБ usable)
Graphics Processor 1: Intel® HD Graphics 530
Graphics Processor 2: NVIDIA GeForce GTX 960M

ADDITIONAL INFORMATION

Comment 1 Nate Graham 2025-09-25 17:30:34 UTC

What specifically changed? A setting in the KCM, or the custom acceleration profile you set on X11?

Comment 2 Bug Janitor Service 2025-10-10 03:47:07 UTC

🐛🧹 ⚠️ 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 3 Bug Janitor Service 2025-10-25 03:47:52 UTC

🐛🧹 This bug has been in NEEDSINFO status with no change for at least 30 days. Closing as RESOLVED WORKSFORME.

Comment 4 Alexander Potashev 2025-10-25 21:44:26 UTC

Re-tested. I thought that KCM options were more limited on Wayland, but it's not the case anymore. Setting these is possible on both X11 and Wayland, and speed & acceleration feel similar across sessions:

 * Pointer speed: 0.20
 * Pointer acceleration: Enabled (checkbox ticked).

The only inconvenience remaining is that I had to tune KCM after switching from X11 to Wayland. Seems like the above settings (speed + acceleration) are stored separately for X11 and Wayland.


Operating System: Fedora Linux 42
KDE Plasma Version: 6.4.5
KDE Frameworks Version: 6.19.0
Qt Version: 6.9.2
Kernel Version: 6.17.4-200.fc42.x86_64 (64-bit)
Graphics Platform: Wayland
Processors: 8 × Intel® Core™ i7-6700HQ CPU @ 2.60GHz
Memory: 16 ГиБ of RAM (15.4 ГиБ usable)
Graphics Processor 1: Intel® HD Graphics 530
Graphics Processor 2: NVIDIA GeForce GTX 960M

Comment 5 Alexander Potashev 2025-10-25 21:45:03 UTC

Created attachment 186154 [details]
screenshot ru_RU X11

Comment 6 Alexander Potashev 2025-10-25 21:45:21 UTC

Created attachment 186155 [details]
screenshot ru_RU Wayland