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This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.
** Changed in: linux (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1579984
Title:
Dell dock MAC Address pass through doesn't work in Ubuntu
Status in linux package in Ubuntu:
Incomplete
Status in network-manager package in Ubuntu:
New
Status in systemd package in Ubuntu:
New
Bug description:
Dell systems with Type-C ports support a feature called "MAC address" pass
through.
This feature allows systems to set a persistent system MAC address to be used
with the TB15, WD15 and Type-C ethernet adapter.
More information is available here:
http://www.dell.com/support/article/us/en/19/SLN301147/en
This function works by a system specific MAC address (referred to as
an auxiliary mac address) being programmed in the factory. When the
driver for the type-c ethernet (in dock or dongle) is loaded the MAC
address is supposed to be overridden with this value.
To enable this in Linux I see 3 parts of the stack that need to be fixed:
1) The value of the auxiliary address needs to be exposed to the OS in the
kernel.
2) The "consistent driver naming scheme" needs to rename to the auxiliary
name in a udev rule.
3) Network Mangager needs to not reset to the HW address when this scenario
is detected.
For 1:
------
I've added support for bubbling up this information from the kernel into
sysfs in:
/sys/devices/platform/dell-laptop/auxiliary_mac
Through this patch:
https://patchwork.kernel.org/patch/9047581/
Here is a sample of what it's output looks like:
$ cat /sys/devices/platform/dell-laptop/auxiliary_mac
847BEB5992D2
When that patch is accepted upstream, it will need to be backported to
Ubuntu to enable exporting this data.
For 2:
------
I've got a udev rule and helper script that will do this part. I'll attach
it to this bug.
For 3:
------
Network manager needs to know to reset the ethernet adapter to the original
MAC address but rather to this value (if available). As it stands today even
with the udev rule in place if network manager is running it immediately resets:
NetworkManager[4513]: <info> [1462846115.2330] device
(en847BEB5992D2): reset MAC address to 9C:EB:E8:30:B0:A8
squashing the udev rule.
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