I do not have the device; I was merely pointing out that the version you can download from Atheros will make correctly.
What driver are you using for the AR8151?
I believe the pci.id for your device is 1969:1073. Verify with:If so, your device is not supported in the built-in version of atl1e, but is in the version you can build from what you downloaded:
Post back if you get stuck.
# modinfo atl1e
author: Atheros Corporation, <firstname.lastname@example.org>, Jie Yang <email@example.com>
description: Atheros Gigabit Ethernet driver
--- snip ---