I had a look at what JMicron's driver does differently from the version included with Linux. It appears that it periodically checks for link failure after autonegotiation and then automatically tries renegotiating with only lower speed(s) enabled.
So this is faulty hardware that can't maintain a 1000BASE-T link with some link partners. But since it works with others, disabling 1000BASE-T operation completely would cause a regression for some users. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/880316 Title: Link not detected / cable seems unplugged with jme - JMicron JMC250 Gigabit Ethernet Controller Status in linux package in Ubuntu: Confirmed Bug description: I'm trying to install Ubuntu on a Shuttle XS35GTV2. The installer can't set up the network connection. I've tried Ubuntu 10.04 32 and 64 bit netinstall, minimal and server, Ubuntu 11.10 32 bit netinstall. The Debian Squeeze 64 bit netinstall installer has no problem. (I've now installed openELEC which has no problems too) I was able to install Ubuntu 10.04 64 bit server but only without network connection. I then could load the jme module: # modprobe jme # depmod -a without errors. But I can't get eth0 running. The output of lspci is: 02:00.5 Ethernet controller: JMicron Technology Corp. JMC250 PCI Express Gigabit Ethernet Controller (rev 03) 03:00.0 Network controller: Realtek Semiconductor C., Ltd Device 8176 (rev 01) # lshw -C network *-network DISABLED description: Ethernet interface product: JMC250 PCI Express Gigabit Ethernet Controller vendor: JMicron Technology Corp. physical id: 0.5 bus info: pci@0000:02:00.5 logical name: eth0 version: 03 serial: 80:ee:73:1f:ef:df size: 10MB/s capacity: 1GB/s width: 32 bits clock: 33MHz capabilities: pm pciexpress msix msi bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation configuration: autonegotiation=off broadcast=yes driver=jme driverversion=1.0.5 duplex=half latency=0 link=no multicast=yes port=MII speed=10MB/s resources: irq:17 memory:feaf4000-feaf7fff ioport:dc00(size=128) ioport:d800(size=256) *-network UNCLAIMED description: Network controller product: Realtek Semiconductor Co., Ltd. vendor: Realtek Semiconductor Co., Ltd. physical id: 0 bus info: pci@0000:03:00.0 version: 01 width: 64 bits clock: 33MHz capabilities: pm msi pciexpress bus_master cap_list configuration: latency=0 resources: ioport:e800(size=256) memory:febfc000-febfffff I've posted my problem at the Ubuntu users mailing list: http://www.linux-archive.org/ubuntu-user/588603-jme-module-missing-netboot-installation.html Edit: Unfortunately I couldn't reassign it as it has nothing to do with gnome-nettools (see post #1). To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/880316/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp