Version: (using KDE KDE 3.5.6) Installed from: Ubuntu Packages OS: Linux The Defaults button in various control modules do not behave consistently. Some will revert to the default KDE/distribution settings, some will not do anything at all. This has been raised in Ellen Reitmeyr's blog post: http://www.kdedevelopers.org/node/1805 Kubuntu bug: https://launchpad.net/ubuntu/+source/kde-systemsettings/+bug/40381
Actually (KDE4), if no default value is available, the default button is disabled. Anyway this is similar to bug #103843.