[Bug 296675] em0 WOL not working in 15.1 (82579LM)

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=296675

            Bug ID: 296675
           Summary: em0 WOL not working in 15.1 (82579LM)
           Product: Base System
           Version: 15.1-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: [email protected]
          Reporter: [email protected]

Created this bug report because of the response in the mailinglist:
https://lists.freebsd.org/archives/freebsd-net/2026-July/009094.html

I have a machine which was running TrueNAS with FreeBSD 13.3 and it used WOL to
wake up sometimes to do backups.

I now upgraded the machine to 15.1 and installed Sylve and some other tools to
do backups. All fine, but WOL does not work anymore.

It is this machine: https://dmesgd.nycbug.org/dmesgd?do=view&id=9019.

The network adapter is em0.

em0: <Intel(R) 82579LM> port 0xf080-0xf09f mem
0xf7d00000-0xf7d1ffff,0xf7d39000-0xf7d39fff irq 20 at device 25.0 on pci0
em0: EEPROM V0.13-4
em0: Using 1024 TX descriptors and 1024 RX descriptors
em0: Using an MSI interrupt
em0: Ethernet address: [_MAC_XXXXXXXXXX]
em0: netmap queues/slots: TX 1/1024, RX 1/1024

ifconfig shows WOL_MAGIC is enabled, and I didn't change anything in the BIOS
when I upgraded to 15.1. Any thoughts on this?
NB: I have another Dell machine with em0 ("em0: <Intel(R) I219-LM SPT(5)>")
which does WOL fine. (https://dmesgd.nycbug.org/dmesgd?do=view&id=9017)

It runs ZFS+BE so I can easily put 14.x on it or reboot back into 13.x.

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