Since upgrading to 4.6.2, selecting shutdown or reboot just ends the KDE session and drops to tty1. There is some discussion going on here https://bugs.kde.org/show_bug.cgi?id=270228 Reproducible: Always
Created attachment 269041 [details, diff] KDM patch from the upstream bug report
Created attachment 269043 [details, diff] Ebuild revision-bump patch
Lets wait for it to propagate to git.
Fixed in main tree. Thanks for report.