Hello!
I have a Lenovo Thinkpad Thunderbolt 3 Dock Gen 2 connected to a Dell
Latitude 5400. I'm running a vanilla 5.8.16 kernel. MAC pass-through
does not work out of the box. I've narrowed the problem down to the
following:
Here is the part of the code from the vanilla kernel that does not work
in my setup:
drivers/net/usb/r8152.c: static int vendor_mac_passthru_addr_read(struct r8152
*tp, struct sockaddr *sa):
...
if (test_bit(LENOVO_MACPASSTHRU, &tp->flags)) {
mac_obj_name = "\\MACA";
mac_obj_type = ACPI_TYPE_STRING;
mac_strlen = 0x16;
} else {
...
With the code above, vendor_mac_passthru_addr_read exits without success
here:
....
status = acpi_evaluate_object(NULL, mac_obj_name, NULL, &buffer);
obj = (union acpi_object *)buffer.pointer;
if (!ACPI_SUCCESS(status))
{
return -ENODEV;
}
...
If I change the first code snippet to this:
...
if (test_bit(LENOVO_MACPASSTHRU, &tp->flags)) {
mac_obj_name = "\\_SB.AMAC";
mac_obj_type = ACPI_TYPE_BUFFER;
mac_strlen = 0x17;
} else {
...
MAC pass-through works fine!
I don't know if this is true for all Lenovo Thinkpad Thunderbolt 3
Docks, I only have this one.
Regards,
Christian
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https://bugs.launchpad.net/bugs/1827961
Title:
Lenovo dock MAC Address pass through doesn't work in Ubuntu
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