This problem is described on the KDE forums here: https://forum.kde.org/viewtopic.php?f=17&t=111610. I did not have the same success that they described, but have not spent as much time on it. I believe it may be related to the Intel i845 graphics chipset I have, as that chipset has given trouble in the past. I didn’t see a SuSE bug report, but didn’t make a new one as I’ll be away for work and won’t be able troubleshoot any more, unfortunately. But my primary system is running 13.1 without any trouble.