Ubuntu
systemsettings package

  1. Bug #1832099
  2. Comment #23

Comment 23 for bug 1832099

Revision history for this message
In , SiLeNcE (bastian-beischer) wrote :

I believe this bug is triggered for X11 on systems which do not actually have a touchpad. I think the problem is:

Since

https://github.com/KDE/plasma-desktop/commit/ce84d6ab4babc80707f4e4c1deb02cfe3ac5b7bb

TouchpadConfigContainer::m_plugin is null, because TouchpadBackend::implementation() does not have m_mode properly set. setMode() is supposed to be called in XlibBackend::findTouchpad(), but this goes through the list of touchpads, which can be none, and calls setMode() on each such touchpad.

So setMode() is never actually called and m_mode is (implicitly!) initialized to WaylandLibinput (since it does not get set in TouchpadBackend constructor). Then getMode() does not return any of the expected cases in isPlatformX11() branch, which means m_plugin stays a nullptr and then there is a crash in TouchpadConfigContainer::sizeHint().