Martin Graesslin <ahref="http://blog.martin-graesslin.com/blog/2010/09/driver-dilemma-in-kde-workspaces-4-5/">looksat problems with the interaction between KWin and some graphics drivers."Now that I have explained all our checks we did to ensure a smoothuser experience, I want to explain how it could happen that there areregressions in 4.5. In 4.5 we introduced two new features which requireOpenGL Shaders: the blur effect and the lanczos filter. Both are not hardrequirements. Blur effect can easily be turned off by disabling the effectand the lanczos filter is controlled by the general effect level settingswhich is also used for Plasma and Oxygen animations. Both new featurescheck for the required extensions and get only activated iff the driverclaims support for it. So everything should be fine, shouldn't it?Apparently not when it comes to the free graphics drivers (please note andremember: we do not see such problems with the proprietary NVIDIAdriver!)." (Thanks to Jos Poortvliet)

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