This happens on a desktop systems too, for example here: 
ubuntu 13.10

uname -a
Linux nick-desktop 3.11.0-13-generic #20-Ubuntu SMP Wed Oct 23 07:38:26 UTC 
2013 x86_64 x86_64 x86_64 GNU/Linux

lspci | grep -i ethern
00:19.0 Ethernet controller: Intel Corporation 82566DC-2 Gigabit Network 
Connection (rev 02)

after resume, network manager comes with "network disabled" and if you
enable it, nothing happens. However doing dhclient eth0 setup the
interface properly.

Also: issuing sudo killall NetworkManager - brought back its
functionality, so that may be used as a workaround for now.

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https://bugs.launchpad.net/bugs/858188

Title:
  168c:002b [Asus K52JT] Network manager fails to reconnect after
  suspend/resume

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