From the discussion about this (and bug 338669, which seems to be a dupe) at https://bugs.kde.org/show_bug.cgi?id=187356 it sounds like this is a Qt bug, rather than a video driver issue.
From the discussion about this (and bug 338669, which seems to be a dupe) at https:/ /bugs.kde. org/show_ bug.cgi? id=187356 it sounds like this is a Qt bug, rather than a video driver issue.