Ubuntu

Comment 2 for bug 640596

Chris Halse Rogers (raof) wrote :

I think this should be fixed by kde-window-manager 4:4.5.1-0ubuntu3 with the change:

* Add kubuntu_29_fallback_to_xrender_compositing.diff
  fallback to XRender compositing in case of Software Rasterizer.
  (backport from trunk)

Have you tried it with the more recent kde-window-manager?