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[Meik <ml@xxxxxxxxxxxxx>]

Okay, looks like this ethernet interface issue is NOT related to ACPI.

I managed to get the ethernet interface working. I disabled network
manager, put a basic configuration for eth0 in /etc/network/interfaces
and ran "ifup eth0". No problems anymore. Playing around a bit, this
looks like network manager jumps is the causing the issue. The second he
jumps in, he breaks the configuration in some way.

For now this is okay, I have some work to do.

Not sure, how to follow up. This is definitively an issue to be fixed,
please advice if this bug should be reassigned to networking and if I
add updates on my further investigations on nm/dnsmasq, or if you want
me to open a new bug directly targeted at those components.

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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:
  Incomplete

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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