If anyone has a patch to fix this, please add it to the bug. I'll mention in passing that while upstream still is an active KDE developer, numlockx itself hasn't seen any new release in a long time.
However, upstream still welcomes patches, such as the recent one I submitted to autoreconf the packge for X.org 7 compatibility, which resulted in a minor upstream release. -- Martin-Éric Racine http://q-funk.iki.fi
