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[Angelos Sfakianakis <angelos.sfakianakis@xxxxxxxxx>]

In my case, the User Interface (Unity) seems to work fine. However, the system is at a peculiar state. It can't shutdown, restart or suspend (not even from the Terminal) and the Network Manager is not showing any connections. Also, most applications can't be started after a suspend. However, the system restarts when instructed to do so as root (`sudo restart`).
The problem doesn't occur always, but about half the times (thus it is really annoying)!
I hope my comment will help locate and/or fix the Bug... :D

PS. My graphics card is an NVIDIA GeForce 520M (512MB DDR2 RAM) and my
processor is an Intel Atom N2700 @2.13GHz. Of course, I use Ubuntu 13.10
(upgraded from Ubuntu 13.04)...

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https://bugs.launchpad.net/bugs/1220719

Title:
  NetworkManager not setting proper state after suspend

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  This issue is being experienced on a Lenovo T430 laptop running 13.10
  with the latest updates. It has been happening since roughly the time
  I upgraded to 13.10, but was not happening with 13.03 and the 3.11
  kernel.

  After resuming from suspend, many times NetworkManager will not list
  any connections, will not connect to wired networks, and will only
  show "Network Enabled" unchecked in the drop-down menu.

  NetworkManager Status:

  tcameron@HOSTNAME:~$ nmcli nm status
  RUNNING         STATE           WIFI-HARDWARE   WIFI       WWAN-HARDWARE   WWAN
  running         asleep          enabled         enabled    enabled         disabled

  Using nmcli to set the sleep state to false re-enables networking
  manually.

  tcameron@HOSTNAME:~$ nmcli nm sleep false
  RUNNING         STATE           WIFI-HARDWARE   WIFI       WWAN-HARDWARE   WWAN
  running         connected       enabled         enabled    enabled         enabled

  tcameron@HOSTNAME:~$ nmcli nm status
  RUNNING         STATE           WIFI-HARDWARE   WIFI       WWAN-HARDWARE   WWAN
  running         connected       enabled         enabled    enabled         enabled

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: network-manager 0.9.8.0-0ubuntu19
  ProcVersionSignature: Ubuntu 3.11.0-4.9-generic 3.11.0-rc7
  Uname: Linux 3.11.0-4-generic x86_64
  ApportVersion: 2.12.1-0ubuntu3
  Architecture: amd64
  Date: Wed Sep  4 09:23:13 2013
  IfupdownConfig:
   # interfaces(5) file used by ifup(8) and ifdown(8)
   auto lo
   iface lo inet loopback
  InstallationDate: Installed on 2012-11-02 (305 days ago)
  InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
  IpRoute:
   <snipped for privacy>
  MarkForUpload: True
  NetworkManager.state:
   [main]
   NetworkingEnabled=true
   WirelessEnabled=true
   WWANEnabled=true
   WimaxEnabled=true
  SourcePackage: network-manager
  UpgradeStatus: Upgraded to saucy on 2013-08-14 (21 days ago)
  nmcli-dev:
   DEVICE     TYPE              STATE         DBUS-PATH
   wlan0      802-11-wireless   connected     /org/freedesktop/NetworkManager/Devices/1
   eth0       802-3-ethernet    connected     /org/freedesktop/NetworkManager/Devices/0
  nmcli-nm:
   RUNNING         VERSION    STATE           NET-ENABLED   WIFI-HARDWARE   WIFI       WWAN-HARDWARE   WWAN
   running         0.9.8.0    connected       enabled       enabled         enabled    enabled         enabled

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