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Oups

Je déterre ce post car j'ai trouvé quelques éléments qui peuvent servir à ceux qui se trouvent (toujours et encore dans cette situation)
Après avoir flashé mon BIOS, - comme indiqué ci-dessus - il y a quelques progrès mais le problème de ré-allumage automatique se produit encore de temps en temps...

Sur le WIKI anglais, on trouve les infos suivantes :
https://wiki.archlinux.org/index.php/Wa ... nel_quirks

Article Wake-on-LAN du wiki anglais

Wake-up after shutdown

It is known that some motherboards are affected by a bug that can cause immediate or random wake-up after a shutdown whenever the BIOS WoL feature is enabled (as discussed in this thread for example).

**Fix using BIOS Settings**

The following actions in the BIOS preferences can solve this issue with some motherboards:

Disable all references to xHCI in the USB settings (note this will also disable USB 3.0 at boot time)
Disable EuP 2013 if it is explicitly an option
Optionally enable wake-up on keyboard actions

Note: There are mixed opinions as to the value of #3 above and it may be motherboard dependent.

**Fix by Kernel quirks**

The issue can also be solved by adding the following kernel boot parameter: xhci_hcd.quirks=270336 This activates the following quirks:

XHCI_SPURIOUS_REBOOT
XHCI_SPURIOUS_WAKEUP

Solutions à tester !