Enable Suspend and Hibernate via keyboard shortcuts in KDE 4.6/ Kubuntu

The commands are

dbus-send --print-reply --dest='org.freedesktop.PowerManagement' /org/freedesktop/PowerManagement org.freedesktop.PowerManagement.Suspend 

for SUSPEND

dbus-send --print-reply --dest='org.freedesktop.PowerManagement' /org/freedesktop/PowerManagement org.freedesktop.PowerManagement.Hibernate

for HIBERNATE

I assign these commands to keyboard shordcuts  - Shortcut and Gestures>Custom Shortcuts>Edit>New>Global Shortcut>Command/Url :)