You could give this Kext a try if you are using one of the following Mainboards:
GIGABYTE motherboards had Used the same VIA VT2021 and Atheros AR8151, :
1.GA-Z77X-UD3H
2.GA-Z77X-D3H
3.GA-Z77-D3H
4.GA-Z77MX-D3H TH, Thunderbolt X2
5.GA-Z77M-D3H
6.GA-H77-D3H
7.GA-H77M-D3H
8.GA-Z77X-UD3H-WB WiFi