This happens to me regularly, every time I have a problem in standby,
shutdown, or resume.

The same bug in Debian is http://bugs.debian.org/cgi-
bin/bugreport.cgi?bug=576279 "network-manager-kde: Tray icon non-
functional, shows "Network Management disabled" message".  I think this
bug is the same as Bug #553994 in plasma-widget-networkmanagement
(Ubuntu): “knetworkmanager doesn't connect with networkmanager”?

In my case (and many others, Google "NetworkManager.state knetworkmanager") the 
reason the underlying NetworkManager system isn't running is probably bug 
#524454 ; at some point NetworkManager writes out a 
/var/lib/NetworkManager/NetworkManager.state file containing
  NetworkingEnabled=false
and so it does nothing on reboot! Restarting knetworkmanager/NetworkManager 
won't help, it'll just see NetworkingEnabled=false and remain disabled.  This 
suggests knetworkmanager may need to both re-enable and restart NetworkManager.

So another workaround (besides running Gnome's Network Manager) is in a 
terminal enter the commands
  sudo rm var/lib/NetworkManager/NetworkManager.state
  sudo restart network-manager
You may have to manually kick networking back on with commands like `sudo 
ifconfig eth0 up` (where eth0 is your network interface) and `sudo dhclient`.

** Bug watch added: Debian Bug tracker #576279
   http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=576279

-- 
KNetworkManager can't enable networking, have to switch to GNOME to enable
https://bugs.launchpad.net/bugs/576154
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