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Hi !

Good to know that I'm not alone :D.

Well, basicaly, we should identify the source of our problem. This can be done by :

  • identifying the compilation options and looking for differences between the configuration file of the 4.12 and 4.13 branches (those file can be found in /boot/config*)
  • comparing the kernel options on boot, visible in your /boot/grub2 or /boot/efi/grub2 grub.cfg file. By I don't expect to see any difference in here.

Unfortunately, I don't have time to investigate on this :(. Anyway, as the drain is very similar to the one we had without disabling WOL on the Ethernet Card (mine uses r8168 driver), I tend to suspect this driver. If you've got time, try to read the changelog and identify the changes between the two series, about the ethernet driver and the wifi driver (mine is rt8723be).

As you mentioned it, if the drains is absent when forcing the shutdown through the power button, we should incriminate the poweroff procedure. There's maybe a network service that restarts the network service, without reloading our handwritten service that disables WOL.