Bug 438294

Summary:	[Wayland] Scroll speed varies within applications
Product:	[Plasma] kwin	Reporter:	Jeffrey Bouter <kde>
Component:	libinput	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	RESOLVED UPSTREAM
Severity:	normal	CC:	nate
Priority:	NOR
Version First Reported In:	5.22.0
Target Milestone:	---
Platform:	Neon
OS:	Linux
URL:	https://bugreports.qt.io/browse/QTBUG-56075
See Also:	https://bugs.kde.org/show_bug.cgi?id=380311
Latest Commit:		Version Fixed In:
Sentry Crash Report:

Description Jeffrey Bouter 2021-06-08 21:24:48 UTC

SUMMARY

The scrolling speed within applications (using a touchpad) varies hugely. System settings, for example, has a very slow scroll speed. Whereas Firefox has a very fast scroll speed.


STEPS TO REPRODUCE
1. Use a wayland session
2. Use a touchpad for scrolling
3. Try scrolling in different applications and observe the difference

OBSERVED RESULT

Scroll speed/sensitivity varies within applications

EXPECTED RESULT

Scroll speed to be the same in all applications

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: KDE Neon
(available in About System)
KDE Plasma Version: 5.22.0
KDE Frameworks Version: 5.82.0
Qt Version: 5.15.3

ADDITIONAL INFORMATION

Comment 1 Nate Graham 2021-06-09 23:17:53 UTC

Firefox does scrolling its own special way that only it controls; if you find it unpleasantly different from other apps, you'll need to go bug the Firefox people about it.

Slow scrolling in QtQuick-based apps is actually the intended speed according to the Qt developers, and the fact that it's faster on X11 is a bug; see https://bugreports.qt.io/browse/QTBUG-56075.

In the Plasma Wayland session, you can increase the scroll speed if you want, though.

Comment 2 Jeffrey Bouter 2021-06-10 08:31:04 UTC

So in order to get pleasant scrolling in Wayland on plasma, I'll have to accept that Firefox races through? That's too bad. Thanks for your reply, Nate!