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[Brad Figg <brad.figg@xxxxxxxxxxxxx>]

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

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https://bugs.launchpad.net/bugs/1516407

Title:
  Ethernet interface stops working after a few seconds

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  After plugging a ethernet cable into the laptop (Dell Latitude E7440),
  Network Manager picks up as expected, requests a IP address and
  configures the interface. After a couple of seconds, the interface
  stops working. The interface start to response to packets only after
  unplugging the cable and plugging it in again; disabling and enabling
  the interface does not help.

  With dmesg I can see some ACPI errors everytime I plug a cable:

  [   76.322029] e1000e: eth0 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: None
  [   81.345308] ACPI Error: Index value 0x0000000000000083 overflows field width 0x7 (20150619/exfldio-341)
  [   81.345329] ACPI Error: Method parse/execution failed [\NEVT] (Node ffff88040e0c7258), AE_AML_REGISTER_LIMIT (20150619/psparse-536)
  [   81.345344] ACPI Error: Method parse/execution failed [\_SB_.PCI0.LPCB.ECDV._Q66] (Node ffff88040e0c4b90), AE_AML_REGISTER_LIMIT (20150619/psparse-536)

  The 15 second gap between "Link is Up" and the ACPI error matches
  nicely the max. 15 ping echoes received.

  I found bug 1501993 " drivers/gpu/drm/i915/intel_display.c:12326
  check_crtc_state+0x2c5/0x440 [i915]() ", which has a completely
  different effect, but states exactly the same ACPI errors in comment
  #35.

  Tried BIOS A16, A10 and A04, also kernels  4.2.0-18-generic
  (current),  4.2.0-16-generic and the vanilla 4.3.0-040300-generic, but
  without any effect or changed behaviour.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: linux-image-4.2.0-18-generic 4.2.0-18.22
  ProcVersionSignature: Ubuntu 4.2.0-18.22-generic 4.2.3
  Uname: Linux 4.2.0-18-generic x86_64
  ApportVersion: 2.19.1-0ubuntu4
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  meik       1538 F.... pulseaudio
   /dev/snd/controlC1:  meik       1538 F.... pulseaudio
  CurrentDesktop: MATE
  Date: Sun Nov 15 19:56:08 2015
  HibernationDevice: RESUME=UUID=3fec7530-b539-4773-ac1e-c1357f0b9e52
  InstallationDate: Installed on 2015-04-22 (207 days ago)
  InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
  MachineType: Dell Inc. Latitude E7440
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.2.0-18-generic root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-4.2.0-18-generic N/A
   linux-backports-modules-4.2.0-18-generic  N/A
   linux-firmware                            1.149.2
  SourcePackage: linux
  UpgradeStatus: Upgraded to wily on 2015-10-23 (23 days ago)
  dmi.bios.date: 09/01/2015
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A16
  dmi.board.name: 0PPXP5
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA16:bd09/01/2015:svnDellInc.:pnLatitudeE7440:pvr00:rvnDellInc.:rn0PPXP5:rvrA00:cvnDellInc.:ct9:cvr:
  dmi.product.name: Latitude E7440
  dmi.product.version: 00
  dmi.sys.vendor: Dell Inc.

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