Bug 406331

Summary:	Slow schrool with mouse scroll wheel
Product:	[Plasma] plasma-integration	Reporter:	Emmett Culley <lst_manage>
Component:	general	Assignee:	Plasma Bugs List <plasma-bugs-null>
Status:	RESOLVED DOWNSTREAM
Severity:	major	CC:	nate
Priority:	NOR
Version First Reported In:	5.15.4
Target Milestone:	---
Platform:	Fedora RPMs
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description Emmett Culley 2019-04-08 14:17:53 UTC

Since Update of Fedora today, 4/4/19, mouse scroll wheel is slow.  It take between 7 an 8 "clicks" of the wheel to cause any page to scroll.  It doesn't seem to be application specific, as I have this problem in Chrome and well and Konsole.  Alll aps I've tested so far.  Including PHPstorm, a Java app.


STEPS TO REPRODUCE
1. Login into plasma desktop
2. Open the Chrome web browser
3. Roll mouse wheel

OBSERVED RESULT
Extremely slow scrolling.  Note that grabbing the scroll bar does scroll as expected.  It is only the mouse wheel that has this issue.

Disabling the mouse detent click does not improve the scroll speed.


EXPECTED RESULT
Viewport to scroll one line or more per wheel detent click


SOFTWARE/OS VERSIONS
Operating System: Fedora 29
KDE Plasma Version: 5.14.5
Qt Version: 5.11.3
KDE Frameworks Version: 5.55.0
Kernel Version: 5.0.5-200.fc29.x86_64
OS Type: 64-bit
Processors: 12 × AMD Ryzen 5 2600 Six-Core Processor
Memory: 15.7 GiB of RAM

ADDITIONAL INFORMATION
WOrk perfectly prior to this morning's dnf upgrade

Comment 1 Nate Graham 2020-09-29 21:17:41 UTC

If it's happening in all apps including non-KDE ones, then issue is lower in the stack than anything we control. You should contact your distro to see if they switched input drivers on you or something. I wonder if this was the release in which they switched from evdev to libinput, maybe.