On Wed, 30 Sep 2020 22:11:02 +0200
Heiner Kallweit [off-list ref] wrote:

On 30.09.2020 20:00, Petr Tesarik wrote:
[...]

quoted

WoL still does not work on my laptop, but this might be an unrelated
issue, and I can even imagine the BIOS is buggy in this regard.
  

A simple further check you could do:
After sending the WoL packet (that doesn't wake the system) you wake
the system by e.g. a keystroke. Then check in /proc/interrupts for
a PCIe PME interrupt. If there's a PME interrupt, then the network
chip successfully detected the WoL packet, and it seems we have to
blame the BIOS.

Well, the switch does not sense carrier on the corresponding port while
the laptop is suspended, so I'm pretty sure nothing gets delivered over
that link. No, I suspect the ACPI suspend method turns off the RTL8208
PHY chip, maybe as a side effect...

But I don't need working WoL on this system - look, this is cheap old
stuff that the previous owner considered electronic waste. I even
suspect this was because wired network never worked well after resume.
With your fix, this piece can still serve some purpose.

Thank you!

Petr T