Information
Solaris 11 does not enable the suspend capability by default and now uses the poweradm command to suspend the system.
Bear in mind that users with physical access to a system can simply remove power from the machine if they are truly motivated to take the system off-line, and granting the capability to use poweradm may be a more graceful way of allowing desktop users to shut down their own machines.
Solution
Perform the following to implement the recommended state:
# poweradm set suspend-enable=false
# poweradm update