"failed to suspend session"

[Ulli Horlacher]

I am running xfce with xubuntu 12.04 on a Thinkpad T61 with xdm.

When I select "suspend" from the user/logout menu I get:
"failed to suspend session" "not authorized" 

In the Power Manger menu on "When laptop lid is closed" I can only choose
"nothing" or "Lock screen", there is no "suspend" or "hibernate".

Any ideas, what is wrong? 

-- 
Ullrich Horlacher              Informationssysteme und Serverbetrieb
Rechenzentrum IZUS/TIK         E-Mail: horlacher at tik.uni-stuttgart.de
Universitaet Stuttgart         Tel:    ++49-711-68565868
Allmandring 30a                Fax:    ++49-711-682357
70550 Stuttgart (Germany)      WWW:    http://www.tik.uni-stuttgart.de/
REF:<20140311085701.GA30517 at rus.uni-stuttgart.de>