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[Paulo Marcel Coelho Aragão <1252121@xxxxxxxxxxxxxxxxxx>]

It is still happening in Xubuntu 14.10. After coming back from suspend
(closed the laptop lid), NetworkManager is asleep:

RUNNING         STATE           WIFI-HARDWARE   WIFI       WWAN-HARDWARE   WWAN      
running         asleep          enabled         enabled    enabled         disabled

This workaround works for me: created script /etc/pm/sleep.d/49network-
manager:

#!/bin/sh
#
# work around a NetworkManager bug, waking it up after resume (sometimes it
# stays sleeping after resume)
#

case "$1" in
    suspend|hibernate)
	;;

    resume|thaw)
	nmcli nm status
	nmcli dev status
	state=`nmcli -t -f STATE nm status`
	if [ "$state" = "asleep" ]; then
	    echo "waking up NetworkManager"
	    nmcli nm sleep false
	    nmcli nm status
	fi
	;;
esac

exit 0

I had removed it to test whether the problem had gone away, but put it
back when confirmed it hadn't been solved yet.

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https://bugs.launchpad.net/bugs/1252121

Title:
  missing PrepareForSleep signal after resuming, causing networking to
  stay disabled

Status in NetworkManager:
  New
Status in wicd:
  New
Status in systemd-shim package in Ubuntu:
  Confirmed
Status in systemd-shim source package in Saucy:
  Won't Fix
Status in systemd-shim source package in Trusty:
  Confirmed

Bug description:
  As per request from bug #1184262, this is a new report, along with
  dbus (to be attached)

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: systemd-services 204-0ubuntu19
  Uname: Linux 3.12.0-custom x86_64
  ApportVersion: 2.12.5-0ubuntu2.1
  Architecture: amd64
  Date: Sun Nov 17 20:24:41 2013
  MarkForUpload: True
  SourcePackage: systemd
  UpgradeStatus: Upgraded to saucy on 2013-10-17 (31 days ago)

  SRU INFORMATION:
  FIX: https://github.com/desrt/systemd-shim/commit/9e1ebe3ab (in trusty already)

  Regression potential: Low. Flushing the session bus was introduced in
  version 4 and is obviously bogus as in a system D-BUS service there is
  no session bus. This causes lots of confusing error messages and
  unnecessary overhead like trying to start dbus-launch. Flushing the
  system bus is low-risk, in most cases it's a no-op and it would
  otherwise prevent losing signals after waking up. No known
  regressions.

  TEST CASE: Run several suspend/resume cycles with the lid, session
  indicator menu, and verify that the network comes back up. It is known
  that this fix is necessary but not sufficient, so it is not expected
  to fix all cases. But it should not make things worse, so if network
  now does not come up any more on a machine where it previously worked
  this would count as failure/regression.

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