middle button in kde with touchpad

[janl]

Got a thinkpad with a touchpad and KDE 17.04. The system settings input control panel recognizes it and offers that top-right clicking on the touchpad be registered as middle-click - as in X paste. However it is only recognized as a middle click intermittently, for the most part it registers as a left button click, which is the setting for the pad as a whole. I've set a two finger click to act as middle clich which works. But this contradicts almost 20 years of tochpad use/training.

So it does not work to set the different corner clicks...

ProblemType: Bug
DistroRelease: Ubuntu 17.04
Package: systemsettings 4:5.9.5-0ubuntu0.1
ProcVersionSignature: Ubuntu 4.10.0-35.39-generic 4.10.17
Uname: Linux 4.10.0-35-generic x86_64
ApportVersion: 2.20.4-0ubuntu4.5
Architecture: amd64
CurrentDesktop: KDE
Date: Mon Oct 9 12:03:56 2017
EcryptfsInUse: Yes
InstallationDate: Installed on 2017-07-18 (82 days ago)
InstallationMedia: Kubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412)
SourcePackage: systemsettings
UpgradeStatus: No upgrade log present (probably fresh install)