Network disabled on some wake-ups on saucy laptop [closed]

Use:

sudo touch /etc/pm/sleep.d/network-manager-resume
sudo chmod +x /etc/pm/sleep.d/network-manager-resume
sudo nano /etc/pm/sleep.d/network-manager-resume

Paste the following and save the file. This brings NetworkManager out of suspend mode:

#!/bin/sh

# This script gets NetworkManager out of suspend.
case $1 in
     suspend|suspend_hybrid|hibernate)
    # No need to do anything here.
        ;;
     resume|thaw)
    nmcli nm sleep false
        ;;
esac

_{Source: https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/1184262/comments/23}

I have the same issue. Looks like it's related to power management that does not wake network-manager. After resuming, you can open a terminal and type:

sudo service network-manager restart

It should bring up the network.