kernel-packages team mailing list archive

[Driuchatyi Nikolay <druchaty@xxxxxxxxx>]

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 Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1497005

Title:
  197b:0250 JMicron JMC250 Gigabit ethernet doesn't work

Status in linux package in Ubuntu:
  Triaged

Bug description:
  Laptop ASUS X52JU can't connect to the router ASUS RT-AC68U via
  ethernet. NetworkManager shows that cable is unplugged. Router has
  Gigabit ethernet ports and laptop doesn't see them. I found that it's
  a bug of the JMC kernel module.

  WORKAROUND: The following allows 100 Mbps speed:
  sudo ethtool -s eth0 speed 100 duplex full

  ---
  ApportVersion: 2.14.1-0ubuntu3.13
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  nick       1682 F.... pulseaudio
   /dev/snd/controlC0:  nick       1682 F.... pulseaudio
  CurrentDesktop: Unity
  DistroRelease: Ubuntu 14.04
  HibernationDevice: RESUME=UUID=b3669551-f67b-41f1-a310-6b79e24b871c
  InstallationDate: Installed on 2015-06-16 (93 days ago)
  InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
  MachineType: ASUSTeK Computer Inc. K52JU
  Package: linux (not installed)
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-49-generic root=UUID=c8aa6fb0-2c0a-430d-b6e5-7bb4ebb8346e ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.16.0-49.65~14.04.1-generic 3.16.7-ckt15
  RelatedPackageVersions:
   linux-restricted-modules-3.16.0-49-generic N/A
   linux-backports-modules-3.16.0-49-generic  N/A
   linux-firmware                             1.127.15
  Tags:  trusty
  Uname: Linux 3.16.0-49-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo vboxusers
  _MarkForUpload: True
  dmi.bios.date: 01/25/2011
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: K52JU.206
  dmi.board.asset.tag: ATN12345678901234567
  dmi.board.name: K52JU
  dmi.board.vendor: ASUSTeK Computer Inc.
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: ATN12345678901234567
  dmi.chassis.type: 10
  dmi.chassis.vendor: ASUSTeK Computer Inc.
  dmi.chassis.version: 1.0
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrK52JU.206:bd01/25/2011:svnASUSTeKComputerInc.:pnK52JU:pvr1.0:rvnASUSTeKComputerInc.:rnK52JU:rvr1.0:cvnASUSTeKComputerInc.:ct10:cvr1.0:
  dmi.product.name: K52JU
  dmi.product.version: 1.0
  dmi.sys.vendor: ASUSTeK Computer Inc.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1497005/+subscriptions