I can confirm this with Nvidia Driver 375.66 Ubuntu 16.04 + Kubuntu Backports KDE Plasma Version 5.8.7 Kde Frameworks Version 5.36.0 and sddm
Workaround: use lightdm instead of sddm: > sudo dpkg-reconfigure lightdm -- You received this bug notification because you are a member of Kubuntu Bugs, which is subscribed to plasma-workspace in Ubuntu. https://bugs.launchpad.net/bugs/1684240 Title: Mouse pointer behaves strangely To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers-375/+bug/1684240/+subscriptions -- kubuntu-bugs mailing list kubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/kubuntu-bugs