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[Launchpad Bug Tracker <1553044@xxxxxxxxxxxxxxxxxx>]

[Expired for linux (Ubuntu) because there has been no activity for 60
days.]

** Changed in: linux (Ubuntu)
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/1553044

Title:
  Ethernet Connection randomly disconnects after transmit queue 0 timed
  out

Status in linux package in Ubuntu:
  Expired

Bug description:
  Description of problem:

  Ethernet connection gets disconnected at random apparently without any
  reason. I have tried the following command to restart my ethernet
  connection, `sudo service network-manager restart` though it never
  solved the issue. Every time I have to restart my system to get the
  connection back.

  see: `http://askubuntu.com/questions/615423/ethernet-connection-
  randomly-disconnects-after-transmit-queue-0-timed-out`

  OBSERVATION: It happens more frequently when I make calls in skype or
  hangout. It seems that heavy usage of Ethernet is causing the
  disconnection. It happens in both 32bit and 64bit.

  Debug steps tried so far:

  I tried to change from `r8169` to `r8168` but never solved the
  problem, ethernet connection is unstable as before.

  $ lspci -nnk | grep -iA2 net
  06:00.0 Network controller [0280]: Qualcomm Atheros AR9285 Wireless Network Adapter (PCI-Express) [168c:002b] (rev 01)
          Subsystem: Lenovo Device [17aa:30a1]
          Kernel driver in use: ath9k<br>
  07:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8101E/RTL8102E PCI Express Fast Ethernet controller [10ec:8136] (rev 02)
          Subsystem: Lenovo Device [17aa:392e]
          Kernel driver in use: r8169

  $ dmesg -T | grep eth0
  [Sat May  2 19:52:37 2015] r8169 0000:07:00.0: eth0: RTL8102e at 0xffffc90000348000, 88:ae:1d:3a:ec:ff, XID 04e00000 IRQ 41
  [Sat May  2 19:52:45 2015] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
  [Sat May  2 19:52:51 2015] r8169 0000:07:00.0: eth0: link down
  [Sat May  2 19:52:51 2015] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
  [Sat May  2 19:52:51 2015] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
  [Sat May  2 19:52:56 2015] r8169 0000:07:00.0: eth0: link up
  [Sat May  2 19:52:56 2015] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
  [Sat May  2 20:09:01 2015] NETDEV WATCHDOG: eth0 (r8169): transmit queue 0 timed out
  [Sat May  2 20:09:01 2015] r8169 0000:07:00.0: eth0: link up
  [Sat May  2 20:09:13 2015] r8169 0000:07:00.0: eth0: link up
  [Sat May  2 20:09:19 2015] r8169 0000:07:00.0: eth0: link up
  [Sat May  2 20:09:31 2015] r8169 0000:07:00.0: eth0: link up
  [Sat May  2 20:10:13 2015] r8169 0000:07:00.0: eth0: link up
  [Sat May  2 20:10:55 2015] r8169 0000:07:00.0: eth0: link up
  [Sat May  2 20:12:07 2015] r8169 0000:07:00.0: eth0: link up
  [Sat May  2 20:13:49 2015] r8169 0000:07:00.0: eth0: link up

  After the event as shown in dmesg output my connection is lost.

  NETDEV WATCHDOG: eth0 (r8169): transmit queue 0 timed out

  As a Solution to the problem:

  I installed kernel version `3.2.0-83-generic` manually, it solved the
  problem and ethernet connection is perfect.

  Other kernels in which ethernet connection is stable: 3.2.0-98-generic, 3.2.0-83-generic
  Other kernels in which ethernet connection is not stable: 4.2.0-27-generic, 4.2.0-30-generic, 3.13.0-33-generic, 3.13.0-36-generic, 3.5.0-27-generic

  So it seems to be related to the kernel not with my hardware nor the
  driver.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-4.2.0-27-generic 4.2.0-27.32~14.04.1
  ProcVersionSignature: Ubuntu 4.2.0-27.32~14.04.1-generic 4.2.8-ckt1
  Uname: Linux 4.2.0-27-generic i686
  ApportVersion: 2.14.1-0ubuntu3.19
  Architecture: i386
  CurrentDesktop: Unity
  Date: Fri Mar  4 11:55:30 2016
  InstallationDate: Installed on 2016-02-29 (3 days ago)
  InstallationMedia: Ubuntu 14.04.4 LTS "Trusty Tahr" - Release i386 (20160217.1)
  SourcePackage: linux-lts-wily
  UpgradeStatus: No upgrade log present (probably fresh install)

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