Same on plasma 5, as you can in attachment, tapping buttons with touchscreen has the same effect as touchpad hovering. Running touchegg is a workaround ( not a solution, as then it inherits all touchegg's issues) to get taps working again.
** Attachment added: "Calc plasmoid" https://bugs.launchpad.net/ubuntu/+source/kde-workspace/+bug/1162216/+attachment/4267703/+files/calcplasmoid.png -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1162216 Title: touchscreen does not tap - sometimes To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/kde-workspace/+bug/1162216/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs