An update to confirm the issue also on Kubuntu 16.04.2 with backports: kernel 4.8.0-34-generic #36~16.04.1-Ubuntu SMP KDE Plasma version 5.8.5 KDE Frameworks version 5.28.0 Qt Version 5.6.1
An update to confirm the issue also on Kubuntu 16.04.2 with backports:
kernel 4.8.0-34-generic #36~16.04.1-Ubuntu SMP
KDE Plasma version 5.8.5
KDE Frameworks version 5.28.0
Qt Version 5.6.1