Bug#823286: xserver-xorg-input-libinput: Significant functional regressions for touchapds vs. xserver-xorg-input-synaptics

[Daniel Meissner]

I can confirm that. I'm using KDE and not only is the functionality 
described above gone, in KDEs Touchpad Dialogs, all relevant settings 
are greyed out. I also uninstalled the package and 
xserver-xorg-input-all aswell. Touchpad response immediately came back 
to normal. I would also recommend keeping the synaptics driver the default.