Ubuntu – Wake-on-LAN quit working with latest kernel (Bionic)


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

Best Answer

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


/sbin/ethtool -s [card] wol g

This re-enables WoL every boot.

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