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.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1497005 Title: 197b:0250 JMicron JMC250 Gigabit ethernet doesn't work To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1497005/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
