Bug 424749

Summary:	Cannot scroll a document using a touch screen
Product:	[Applications] okular	Reporter:	Patrick Silva <bugseforuns>
Component:	general	Assignee:	Okular developers <okular-devel>
Status:	RESOLVED FIXED
Severity:	normal	CC:	nate
Priority:	NOR
Version First Reported In:	24.01.75
Target Milestone:	---
Platform:	Neon
OS:	Linux
Latest Commit:		Version Fixed In:
Sentry Crash Report:

Description Patrick Silva 2020-07-28 13:01:13 UTC

SUMMARY
Nothing happens when I try to scroll a pdf or djvu document with the touchscreen of my laptop. This problem exists on both X11 and Wayland sessions.

okular 1.11.70
Operating System: KDE neon Unstable Edition
KDE Plasma Version: 5.19.80
KDE Frameworks Version: 5.73.0
Qt Version: 5.14.2

Comment 1 Nate Graham 2020-07-28 17:46:57 UTC

What kind of touchscreen to you have? Is it by any chance a Wacom screen, or a Lenovo product?

Comment 2 Patrick Silva 2020-07-28 18:13:52 UTC

old lenovo G400S touch laptop.

https://versus.com/en/lenovo-ideapad-g400s-touch-14-intel-core-i3-3120m-2-5ghz-4gb-500gb

Comment 3 Nate Graham 2020-07-28 18:44:45 UTC

I thought so.

Lenovo laptops have Wacom screens, which are affected by a bug in the wacom driver that causes this issue. See https://bugs.launchpad.net/ubuntu/+source/xf86-input-wacom/+bug/1774242

Looks like the fix was released in a later version than the Ubuntu base in Neon. The impending 20.04 rebase should include it.

In the meantime, you can fix it yourself by editing /etc/X11/xorg.conf.d/70-wacom.conf to replace `Driver "wacom"` with `Driver "libinput"` for the section with "Wacom USB touchscreen class" in it.

Comment 4 Patrick Silva 2022-10-29 21:09:46 UTC

My laptop has a Synaptic touchscreen, not Wacom. And I can scroll contents with it in other kde softwares like Dolphin and Kate.
This bug persists on neon unstable based on ubuntu 22.04.

Operating System: KDE neon Unstable Edition
KDE Plasma Version: 5.26.80
KDE Frameworks Version: 5.100.0
Qt Version: 5.15.6
Graphics Platform: Wayland

Comment 5 Patrick Silva 2025-07-27 00:33:34 UTC

Cannot reproduce.

Operating System: KDE neon Unstable Edition
KDE Plasma Version: 6.4.80
KDE Frameworks Version: 6.17.0
Qt Version: 6.9.1
Graphics Platform: Wayland