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[Launchpad Bug Tracker <1553044@xxxxxxxxxxxxxxxxxx>]

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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)

** Affects: linux (Ubuntu)
     Importance: Low
         Status: Incomplete


** Tags: apport-bug i386 trusty
-- 
Ethernet Connection randomly disconnects after transmit queue 0 timed out
https://bugs.launchpad.net/bugs/1553044
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