Fixing Screen Refresh Problems with KDE 4.6

23. February, 2011

If you have problems with your screen in KDE 4.6 (application windows don’t get restored correctly after minimizing them; windows won’t update after a change; when overwriting selected text, part of the selected text stays on the screen; popup windows leave black boxes), try this: Switch the “Compositing Type” from “OpenGL” to “XRender” (in “System Settings” -> “Desktop Effects” -> “Advanced” tab).

As a nice side effect, this reduced the CPU usage of KWin from 10-30% to 0%.

Some desktop effects don’t work with this setting but in return, the UI feels more snappy.