I have the same problem as described in https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1555775. My card is the Killer 1535 and I can't confirm the issue with the wired connection.
The one-time solution given by the poster
sudo su
echo 1 > /sys/bus/pci/rescan
works for me as well. However, I don't know how to make it automatic after resuming from suspend. I tried making a script named alienware_pci_rescan in /etc/pm/sleep.d with the code
#! /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
provided by Andy Barry (abarry-gmail) but it doesn't work. I also tried to find out how shall I change the numbers after .../devices/ in the above script by looking at the information from lspci, but to no avail as I am not sure where to look. Any help?
