I could test on a computer without nvidia hardware and issue does not appear.
So this is related to a combination kwin + nvidia. Le 10 févr. 2017 06:09, "Debian Bug Tracking System" <ow...@bugs.debian.org> a écrit : > Thank you for the additional information you have supplied regarding > this Bug report. > > This is an automatically generated reply to let you know your message > has been received. > > Your message is being forwarded to the package maintainers and other > interested parties for their attention; they will reply in due course. > > Your message has been sent to the package maintainer(s): > Debian/Kubuntu Qt/KDE Maintainers <debian-qt-kde@lists.debian.org> > > If you wish to submit further information on this problem, please > send it to 854...@bugs.debian.org. > > Please do not send mail to ow...@bugs.debian.org unless you wish > to report a problem with the Bug-tracking system. > > -- > 854372: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=854372 > Debian Bug Tracking System > Contact ow...@bugs.debian.org with problems >