[Bug 1252121] Re: missing PrepareForSleep signal after resuming, causing networking to stay disabled

[Paulo Marcel Coelho Aragão]

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

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