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I was using succesfully for weeks this wake on lan script https://www.techrepublic.com/article/how-to-enable-wake-on-lan-in-ubuntu-server-18-04/ with Ubuntu 20.10.

Since a couple of days, the WOL function does not work anymore. Not sure if it was due to a linux kernel upgrade or something similar.

Did anyone else experience something similar? Or do you have a suggestion on how to debug it?

systemctl status wol.service reports that the service is enabled:

● wol.service - Configure Wake On LAN
     Loaded: loaded (/etc/systemd/system/wol.service; enabled; vendor preset: enabled)
     Active: active (exited) since Fri 2021-02-05 13:13:29 CET; 3min 36s ago
    Process: 2484 ExecStart=/sbin/ethtool -s eno1 wol g (code=exited, status=0/SUCCESS)
   Main PID: 2484 (code=exited, status=0/SUCCESS)

feb 05 13:13:29  systemd[1]: Starting Configure Wake On LAN...
feb 05 13:13:29  systemd[1]: Finished Configure Wake On LAN.

But then, the status is disabled:

sudo ethtool eno1 | grep Wake
    Supports Wake-on: pumbg
    Wake-on: d

If I call in the terminal by hand /sbin/ethtool -s eno1 wol g, then it is enabled:

    Supports Wake-on: pumbg
    Wake-on: g

But immediately after a systemctl suspend, I cannot wake it up remotely, and if I wake it up by keyboard, it gets reset to Wake-on: d

Any ideas of how this problem suddenly appeared? I did not modify the BIOS, it is still with WakeUp Event enabled. Maybe some kernel upgrade issues?

Note: after suspending or powering off, the LEDs on the network card completely stop blinking, even if the ethernet cable is plugged. This was not the case one week before.

Thanks in advance for the help.

ferdymercury
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1 Answers1

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This solved it for me:

  • Write WOL_DISABLE=N in the file /etc/tlp.conf

This solution is adapted from this answer.

Nmath
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ferdymercury
  • 145