Martin, I did check that and I think I can preliminary give results that
are quite interesting:

- If I run the ethtool  command before 'systemctl suspend', the bug
hasn't appeared so far - and it does not seem to matter if I run ethtool
with the 'wol g' (enable WOL) or with the 'wol d' flag!

- After I suspended my PC succesfull by running e.g. 'ethtool -s eth0
wol g ; systemctl suspend', the bug seems to stay away untill the next
reboot even I simply use 'systemctl suspend' without ethtool on the next
attempts to suspend.

Thus it seems that for proper suspend on my system it only matters that
ethtool is "poking" the network card one-time after system startup,
regardless if I use it to enable or disable WOL. I'll do further testing
if it is indeed sufficient to put the ethtool command e.g. in
/etc/rc.local to make the bug disappear without any additional steps.

(Allthough it has no influence on the bug there is one relevant
difference between running  ethtool to disable or enable WOL before
systemctl: If I disable WOL, my network is offline after resume, and I
have do run 'ifdown eth0; ifup eth0' to make it work again. If I enable
WOL instead, my network is up after suspend at least most of the time.)

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https://bugs.launchpad.net/bugs/1450396

Title:
  Gigabyte P35-DS3: does not stay suspended

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