The antialiasing problem seems to be caused by the KDE bug mentioned in the cairo bug https://bugs.freedesktop.org/show_bug.cgi?id=7494
[[ I think I've figured out what was all this about, and it's not cairo's fault. In fact, it's been a fix on cairo (http://gitweb.freedesktop.org/?p=cairo;a=commit;h=fe324c44153cf37a51b51883780daee5500173be, TTBOMK) what has exposed bugs in other layers. For example, if I set Xft.antialiasing to 0, with cairo 1.0.4 I still get antialiased apps, but not with cairo 1.2.0. This explain the behavior observed in comment 2, but it's still a bug on KDE (hopefully I can point to an URL later). ]] -- Adeodato Simó The KDE fix mentioned is http://websvn.kde.org/branches/KDE/3.5/kdebase/kcontrol/krdb/krdb.cpp?rev=551202&r1=541552&r2=551202 If this is confirmed fixes it, I think this bug should be reassigned to kdebase. Dave