Comment 41 for bug 184472

@anderlia Unfortunately as you already mentioned it's a problem in x.org, and I don't have an easy way to fix it in KDE. I suspect some things could be done a bit better if we support configuring multiple keyboards (https://bugs.kde.org/show_bug.cgi?id=177889) which might make it a bit more explicit as to which keyboard numlock state goes but even then the problems in x.org will probably create other issues we'll have to deal with.
I'd say this needs to be fixed in upstream or we can just wait for Wayland and hope there will be no problems like these :)