ERROR – AppleUSBEthernet: monitorLinkStatus – Link partner register is bad

Problem
After system update to Mac OS X 10.7.5 (or as other users have reported 10.7.4) the Apple USB Ethernet adapter may stop to work. When plugging the Apple USB Ethernet adapter into the MacBook it will not communicate on the network.

Symptom
The terminal command ifconfig show the ethernet adapter but without IP address.
The terminal command sudo dmesg will show the following:

AppleUSBEthernet::monitorLinkStatus – Link down, Device a861500
0 0 AppleUSBEthernet: monitorLinkStatus – Link partner register is bad, re-trying…
0 0 AppleUSBEthernet: monitorLinkStatus – Link partner register is bad, trying to reset…
AppleUSBEthernet::monitorLinkStatus – Link down, Device a861500
0 0 AppleUSBEthernet: monitorLinkStatus – Link partner register is bad, re-trying…
0 0 AppleUSBEthernet: monitorLinkStatus – Link partner register is bad, trying to reset…

Solution
It seems to be the driver for the Apple USB Ethernet adapter that is the problem. Download the latest from ASIX Electronics. Install it and restart the computer.

Product family: USB 2.0 to fast Ethernet
Product name: AX88772

URL: http://www.asix.com.tw/download.php?sub=downloadsearch&PSNoID=101.

Good luck!

Best regards Mikael Johansson, ComplexIT

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