Comment 12 for bug 631413

A point to consider for risk/benefit of this change is that if we don't get this update in, for Kubuntu we will have to patch kwin to blacklist the blur/lanczos effects and to revert to indirect rendering from direct. Upstream will help with the patch, but doesn't have hardware to actually test this. Also since direct rendering has been the default for KDE 4.5, the indirect rendering code paths probably aren't very tested. The ScottK risk-o-meter rates this course of action "sporting at best".