That's it, thanks! Here is a diff of both kwinrc files (< without borders, > with borders) 6c6 < OpenGLIsUnsafe=true --- > OpenGLIsUnsafe=false 9,10c9,10 < Id_1=20594073-f966-4c01-b85b-66de536db94b < Id_2=a2e0bfbd-a225-4659-8cda-517de34047bf --- > Id_1=fba2f652-b464-42dc-b918-0bba59e25d24 > Id_2=f3b9e745-34d8-4cad-8c12-4f83b1a023d8 11a12,24 > > [Effect-PresentWindows] > BorderActivateAll=9 > > [ElectricBorders] > TopLeft=None > > [TabBox] > BorderActivate=9 > > [Windows] > ElectricBorderMaximize=false > ElectricBorderTiling=false