Same issue here .. I'm using kubuntu raring since yesterday .. suspend on power button worked with quantal, it doesn't work with raring. /usr/bin/qdbus is in place, so that's not the problem .. however, I found out something strange ..
export $dbusaddr; qdbus org.kde.kded ... as user holger does work
su - holger -c "export $dbusaddr; qdbus org.kde.kded" ... produces the message: qdbus: could not find a Qt installation of ''
Same issue here .. I'm using kubuntu raring since yesterday .. suspend on power button worked with quantal, it doesn't work with raring. /usr/bin/qdbus is in place, so that's not the problem .. however, I found out something strange ..
export $dbusaddr; qdbus org.kde.kded ... as user holger does work
su - holger -c "export $dbusaddr; qdbus org.kde.kded" ... produces the message: qdbus: could not find a Qt installation of ''
hope that helps!
regards,
holger