Comment 32 for bug 1497005

I have sent an email to JMicron. There is an answer:

The JMC25x/JMC26x Gigabit Ethernet Chip was mass production at 2008Y, at that time, the IEEE802.3az specification wasn’t ready. So this chip will have a connection issue while connecting to all the IEEE 802.3az enabled devices, that is, if the ‘Speed & Duplex’ feature sets to ”Auto Negotiation” mode or ”1Gbps/Full Duplex” mode, then the link function is abnormal, i.e. link down. Therefore our S/W engineer made a workaround - ASD(Auto-Speed-Down) function to force the LAN speed keeping in 100Mbps when the ‘Speed & Duplex’ feature has been set to “Auto Negotiation” mode or ”1Gbps/Full Duplex” mode.
 My suggestion is to use non-IEEE802.3az Gigabit equipment then your connection speed would keep as 1Gbps.