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WOL was working great on Bionic until yesterday's kernel update. How to diagnose/recover it?

Edit: if set to boot from 4.15.0-23 kernel it works. If set to boot from 4.15.0-24 it does not.

Edit2: WoL can be enabled with 

sudo ethtool -s [card] wol g

but it isn't persistent. Searching for how to set it every boot.

Edit3: Per a comment by Kai-Heng Feng on this bug report this was an advertent change! (and therefore not a bug)

This is because the fix of LP: #1752772 has one commit [1] that disables WoL by default.
Set WoL explicitly should solve your issue.

[1] https://github.com/torvalds/linux/commit/7edf6d314cd061e1d0a1b7bc0b511d64322c3f72
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2 Answers 2

Reset to default
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To make this persistent I created a script in /etc/network/if-up.d

#!/bin/sh

/sbin/ethtool -s [card] wol g

This re-enables WoL every boot.

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  • 1
    This worked for me
    – user2686101
    Commented Jul 7, 2018 at 14:18
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    You may be interested that Arch Linux lists 9 ways to make it persistent (except your method :)): wiki.archlinux.org/index.php/Wake-on-LAN
    – WinEunuuchs2Unix
    Commented Jul 8, 2018 at 18:15
  • 2
    Now there are 10!
    – Organic Marble
    Commented Jul 8, 2018 at 18:18
  • This didn’t work for me in Ubuntu 22.04. However, I was able to create a crontab entry that does the same thing: In the terminal, enter "sudo crontab -e", then enter the line "@reboot /sbin/ethtool -s [card] wol g" where [card] is replaced with the network interface controller (enp4s0 in my case) found by running "ip a".
    – James
    Commented Nov 22, 2023 at 5:13
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It seems that Wol is disabled by default in the r8169 module for now, and now we must use userspace tools like ethtool to get it: #1752772 and r8169 ethernet card don't work after returning from suspension. See also Wake-on-lan Ubuntu support on getting Wake-on-lan persistent on boot. Or just use nm-connection-editor in Network-manager for that.

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