Wake on LAN not working on Ubuntu 16.04

Question

I'm trying to setup wake on LAN on my desktop which has Ubuntu 16.04 running.

I've tried a lot, following different manuals and troubleshooting, but with no luck.

When the computer is off or on suspend, one orange light is on the network card, occasionally slightly flickering. I need to resume or turn on computer via LAN if it is suspended or turned off respectively.

I believe I have wake on LAN enabled in the BIOS.

Some outputs that I think might be relevant,

$ sudo ethtool enp2s0 | grep Wake
    Supports Wake-on: pumbg
    Wake-on: g

$ sudo ethtool -i enp2s0 | grep bus
bus-info: 0000:02:00.0

$ cat /proc/acpi/wakeup | grep 0000:02:00.0
PXSX      S4    *enabled   pci:0000:02:00.0

$ lspci | grep Ethernet
02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 0c)

$ cat /etc/default/halt 
# Default behaviour of shutdown -h / halt. Set to "halt" or "poweroff".
HALT=poweroff
NETDOWN=no

$ sudo tcpdump -i enp2s0 '(udp and port 7) or (udp and port 9)'
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on enp2s0, link-type EN10MB (Ethernet), capture size 262144 bytes
15:31:38.121365 IP <ip>.51603 > <broadcast_ip>.discard: UDP, length 102

I even tried the r8168 driver with no luck.

I'm sending WOL signal with the following command

$ wakeonlan -i <broadcast_ip> <mac_addr>

Any ideas?

Answer 1

I believe I have wake on LAN enabled in the BIOS.

Make sure you have it enabled in BIOS, because it is a pre-requisite of WoL working.

Wake-on: g

Magic packet setting must be persistent. If it is not after power cycle, you might want to try setting in the following file:

/etc/netctl/profile

as follows:

ExecUpPost='/usr/bin/ethtool -s interface wol g'

Further reading on ArchWiki.

Answer 2

Set WOL_DISABLE=N in /etc/default/tlp and NETDOWN=no in /etc/default/halt