This script now solves the problem (although does cause a delay before
wifi connection):
$ cat /etc/pm/sleep.d/alienware_pci_rescan
#! /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 in
resume|thaw)
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
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https://bugs.launchpad.net/bugs/1555775
Title:
WiFi + wired ethernet broken after suspend on Alienware 15 R2
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