I believe that this topic was already covered in the Debian-KDE list, but I can no longer find the references, even in the mailing list archive. Please forgive me if I have missed the obvious.
I have upgraded Libranet Linux 1.9.1 from potato to woody and added KDE 2.2.1 from sid. These upgrades install XFree 4.1.0. I immediately began to experience font problems. In trying to track them down, I updated a number of xfonts, gsfonts, gsfonts-x11 packages. Everything appears to be working now, except that, when anti-aliasing is enabled, the fonts module of KDE Control Center shows none of the standard 35 ``Adobe" fonts installed by gsfonts-x11. This is more important than it might sound because the ``default" font of KDE is Helvetica which is one of the 35 ``gsfonts". Not surprisingly, KDE is unhappy when it cannot find its default font. If anti-aliasing is disabled, the 35 ``standard Adobe fonts" re-appear in the fonts list. (P.S. After each change of anti-aliasing status, KDE needs to be restarted.) Bottom line for the moment: one can have anti-aliasing or the 35 ``standard Adobe fonts" but not both. Is there a way to have one's font cake and eat it too?