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["Jonas G. Drange" <1458839@xxxxxxxxxxxxxxxxxx>]

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

** Tags added: kernel-bug-exists-upstream-4.1-rc2

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https://bugs.launchpad.net/bugs/1458839

Title:
  Poor Wi-Fi connectivity when connecting USB dock

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Reproduce:
  Insert USB dock (Kensington with usb sound card, ethernet card) cable into any USB port

  What happens:
  Wi-Fi connectivity worsens and eventually disconnects.
  Pinging an online target gives me 
  [1432638474.615293] 64 bytes from fra07s30-in-f5.1e100.net (173.194.112.101): icmp_seq=11 ttl=54 time=1172 ms
  [1432638474.636669] 64 bytes from fra07s30-in-f5.1e100.net (173.194.112.101): icmp_seq=12 ttl=54 time=185 ms
  [1432638475.496000] 64 bytes from fra07s30-in-f5.1e100.net (173.194.112.101): icmp_seq=13 ttl=54 time=44.3 ms
  [1432638477.638814] 64 bytes from fra07s30-in-f5.1e100.net (173.194.112.101): icmp_seq=14 ttl=54 time=1185 ms
  [1432638477.644744] 64 bytes from fra07s30-in-f5.1e100.net (173.194.112.101): icmp_seq=15 ttl=54 time=192 ms
  [1432638478.498248] 64 bytes from fra07s30-in-f5.1e100.net (173.194.112.101): icmp_seq=16 ttl=54 time=44.4 ms
  [1432638479.662460] 64 bytes from fra07s30-in-f5.1e100.net (173.194.112.101): icmp_seq=17 ttl=54 time=207 ms
  [1432638480.547434] 64 bytes from fra07s30-in-f5.1e100.net (173.194.112.101): icmp_seq=18 ttl=54 time=90.9 ms
  [1432638482.597835] 64 bytes from fra07s30-in-f5.1e100.net (173.194.112.101): icmp_seq=19 ttl=54 time=1140 ms
  [1432638482.601590] 64 bytes from fra07s30-in-f5.1e100.net (173.194.112.101): icmp_seq=20 ttl=54 time=144 ms
  [1432638484.648946] 64 bytes from fra07s30-in-f5.1e100.net (173.194.112.101): icmp_seq=21 ttl=54 time=1191 ms
  [1432638484.649794] 64 bytes from fra07s30-in-f5.1e100.net (173.194.112.101): icmp_seq=22 ttl=54 time=193 ms
  [1432638485.502967] 64 bytes from fra07s30-in-f5.1e100.net (173.194.112.101): icmp_seq=23 ttl=54 time=45.1 ms
  [1432638487.301295] 64 bytes from fra07s30-in-f5.1e100.net (173.194.112.101): icmp_seq=24 ttl=54 time=842 ms
  [1432638488.649794] 64 bytes from fra07s30-in-f5.1e100.net (173.194.112.101): icmp_seq=25 ttl=54 time=1191 ms
  [1432638488.662959] 64 bytes from fra07s30-in-f5.1e100.net (173.194.112.101): icmp_seq=26 ttl=54 time=196 ms
  [1432638489.514683] 64 bytes from fra07s30-in-f5.1e100.net (173.194.112.101): icmp_seq=27 ttl=54 time=46.7 ms
  [1432638491.653511] 64 bytes from fra07s30-in-f5.1e100.net (173.194.112.101): icmp_seq=28 ttl=54 time=1183 ms
  [1432638491.655011] 64 bytes from fra07s30-in-f5.1e100.net (173.194.112.101): icmp_seq=29 ttl=54 time=176 ms
  [1432638493.659119] 64 bytes from fra07s30-in-f5.1e100.net (173.194.112.101): icmp_seq=30 ttl=54 time=1179 ms
  [1432638493.664250] 64 bytes from fra07s30-in-f5.1e100.net (173.194.112.101): icmp_seq=31 ttl=54 time=177 ms
  [1432638494.534200] 64 bytes from fra07s30-in-f5.1e100.net (173.194.112.101): icmp_seq=32 ttl=54 time=45.9 ms
  …

  Disconnecting the USB cable restores the connectivity:
  [1432638514.584374] 64 bytes from fra07s30-in-f5.1e100.net (173.194.112.101): icmp_seq=52 ttl=54 time=48.5 ms
  [1432638515.577822] 64 bytes from fra07s30-in-f5.1e100.net (173.194.112.101): icmp_seq=53 ttl=54 time=40.1 ms
  [1432638516.579000] 64 bytes from fra07s30-in-f5.1e100.net (173.194.112.101): icmp_seq=54 ttl=54 time=39.9 ms
  [1432638517.580760] 64 bytes from fra07s30-in-f5.1e100.net (173.194.112.101): icmp_seq=55 ttl=54 time=40.5 ms
  [1432638518.583465] 64 bytes from fra07s30-in-f5.1e100.net (173.194.112.101): icmp_seq=56 ttl=54 time=41.4 ms
  [1432638519.583923] 64 bytes from fra07s30-in-f5.1e100.net (173.194.112.101): icmp_seq=57 ttl=54 time=40.1 ms
  …

  What should have happened:
  Connectivity should not be affected by a connected USB dock

  Steps taken to debug:
  * I've told NetworkManager not to manage the USB network card so that it appears unmanaged. This makes no difference.
  * I've tried older kernels, e.g. 3.14 with no luck
  * It does not matter what is connected to the dock

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: linux-image-3.19.0-18-generic 3.19.0-18.18
  ProcVersionSignature: Ubuntu 3.19.0-18.18-generic 3.19.6
  Uname: Linux 3.19.0-18-generic x86_64
  ApportVersion: 2.17.2-0ubuntu1.1
  Architecture: amd64
  AudioDevicesInUse:
   USER PID ACCESS COMMAND
   /dev/snd/controlC0:  jonas      1514 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Tue May 26 13:08:44 2015
  DistributionChannelDescriptor:
   # This is a distribution channel descriptor
   # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor
   canonical-oem-somerville-precise-amd64-20120703-2
  EcryptfsInUse: Yes
  HibernationDevice: RESUME=UUID=7b9cb658-95dd-4e13-a587-d6d0d59ae7e4
  InstallationDate: Installed on 2013-08-27 (637 days ago)
  InstallationMedia: Ubuntu 12.04 "Precise" - Build amd64 LIVE Binary 20120703-15:08
  MachineType: Dell Inc. Dell System XPS L322X
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-18-generic root=UUID=221de9c1-f10a-4be4-9273-5c12864c8680 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.19.0-18-generic N/A
   linux-backports-modules-3.19.0-18-generic  N/A
   linux-firmware                             1.143.1
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 05/15/2013
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A09
  dmi.board.name: 0PJHXN
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: 0.1
  dmi.modalias: dmi:bvnDellInc.:bvrA09:bd05/15/2013:svnDellInc.:pnDellSystemXPSL322X:pvr:rvnDellInc.:rn0PJHXN:rvrA00:cvnDellInc.:ct8:cvr0.1:
  dmi.product.name: Dell System XPS L322X
  dmi.sys.vendor: Dell Inc.

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