https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1555775  #52
has a workaround

put

#! /bin/sh

# This script rescans the PCI bus after resume from suspend to fix
# broken WiFi, wired ethernet, and the card reader on the Alienware 15 R2.
case $1/$2 in
  pre/*)
    echo "Going to $2..."
    # Place your pre suspend commands here, or `exit 0` if no pre suspend 
action required
    ;;
  post/*)
    echo "Waking up from $2..."
    # Place your post suspend (resume) commands here, or `exit 0` if no post 
suspend action required
        echo 1 > /sys/bus/pci/devices/0000\:00\:1c.4/rescan
 echo 1 > /sys/bus/pci/devices/0000\:00\:1c.5/rescan
 echo 1 > /sys/bus/pci/devices/0000\:00\:1c.6/rescan

esac

in file

/lib/systemd/system-sleep/aw_pci_rescan

change permission by

chmod +x

Working for me tested on 16.04 with kernel 4.9

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https://bugs.launchpad.net/bugs/1607571

Title:
  No network devices after suspend and resume

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