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[Driuchatyi Nikolay <druchaty@xxxxxxxxx>]

I faced with the same problem on Ubuntu 14.04/Laptop ASUS X52JU/Router ASUS RT-AC68U.
Laptop has the same ethernet controller.
Workaround with setting up of the speed to 100 is working for me too.

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https://bugs.launchpad.net/bugs/1310798

Title:
  JMicron JMC250 ethernet: networking always disconnected

Status in linux package in Ubuntu:
  Expired

Bug description:
  What is expected in 14.04 is ethernet networking works when cable
  connected. What happens instead is it always shows "disconnected",
  even when cable connected.

  In Ubuntu 12.04, this same ethernet controller also exhibited the same
  problem. However it was fixable by downloading and manually compiling
  a new version of the jme drivers from here:
  ftp://driver.jmicron.com.tw/Ethernet/Linux/jmebp-1.0.8.5.tar.bz . In
  14.04, the above 1.0.8.5 driver no longer compiles and is thus not
  installable. I tried downloading and compiling the latest source for
  the driver from
  https://github.com/torvalds/linux/blob/master/drivers/net/ethernet/jme.c.
  This driver does compile, but after installation still doesn't work,
  with the wired network status always showing "disconnected".

  Output of dmesg | grep jme
  [    2.044151] jme: JMicron JMC2XX ethernet driver version 1.0.8
  [    2.044209] jme 0000:02:00.5: can't disable ASPM; OS doesn't have ASPM control
  [    2.045351] jme 0000:02:00.5 eth0: JMC250 Gigabit Ethernet chiprev:23 pcirev:3 macaddr:80:ee:73:13:68:7d
  [   22.302804] jme 0000:02:00.5: irq 45 for MSI/MSI-X
  [   22.302930] jme 0000:02:00.5 eth0: Link is down
  [   22.328814] jme 0000:02:00.5 eth0: Link is down

  WORKAROUND: The following terminal command provides 100 Mbps ethernet speed:
  sudo ethtool -s eth0 speed 100 duplex full

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-24-generic 3.13.0-24.46 [modified: boot/vmlinuz-3.13.0-24-generic]
  ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
  Uname: Linux 3.13.0-24-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  alex       1540 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Mon Apr 21 16:06:41 2014
  HibernationDevice: RESUME=UUID=9a76734d-f4e5-48af-9ba2-c86f712f39d9
  InstallationDate: Installed on 2014-04-18 (2 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  MachineType: Standard XS35
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-24-generic root=UUID=347d51ff-61a3-4f81-bcc4-125707703d1e ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-24-generic N/A
   linux-backports-modules-3.13.0-24-generic  N/A
   linux-firmware                             1.127
  RfKill:
   0: phy0: Wireless LAN
    Soft blocked: no
    Hard blocked: no
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 03/21/2011
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 080015
  dmi.board.asset.tag: To Be Filled By O.E.M.
  dmi.board.name: B10IE01
  dmi.board.vendor: Shuttle
  dmi.board.version: To be filled by O.E.M.
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: Shuttle
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr080015:bd03/21/2011:svnStandard:pnXS35:pvrToBeFilledByO.E.M.:rvnShuttle:rnB10IE01:rvrTobefilledbyO.E.M.:cvnShuttle:ct3:cvrToBeFilledByO.E.M.:
  dmi.product.name: XS35
  dmi.product.version: To Be Filled By O.E.M.
  dmi.sys.vendor: Standard

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