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
What kind of touchscreen to you have? Is it by any chance a Wacom screen, or a Lenovo product?
old lenovo G400S touch laptop. https://versus.com/en/lenovo-ideapad-g400s-touch-14-intel-core-i3-3120m-2-5ghz-4gb-500gb
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.
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