[Bug 295443] Intel em(4) WOL broken due to ACPI _OSC failure (HP EliteDesk 800 G2)

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=295443

--- Comment #1 from Phil A <[email protected]> ---
Could this be related to Bug 238411?
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=238411
I noticed that in Bug 238411, the em/igb driver strictly relies on the initial
firmware/EEPROM state to initialize adapter->wol. If that check fails or
returns 0, the driver completely ignores any subsequent ifconfig WOL flags at
shutdown.

Do you think a similar mechanism is happening here? Since my HP BIOS triggers a
critical ACPI _OSC failure at boot, could the driver be disabling adapter->wol
internally, preventing the NIC from maintaining power in S5 despite WOL_MAGIC
being armed? If so, could a similar workaround (allowing ifconfig flags to
override the failed ACPI status) be considered?

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