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[Chris Stratford <chris.stratford@xxxxxxxxxxxxx>]

In the attached WifiSyslog.txt an example of this problem starts at "Apr
18 08:17:42" (followed by a network restart to get the vpn working
again)

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https://bugs.launchpad.net/bugs/1571535

Title:
  iwlwifi restarts randomly in xenial

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Recently installed xenial on a Lenovo Yoga 2-13 (Intel 7260 wifi
  card).  On wily it worked perfectly, on xenial it regularly appears to
  restart the wifi connection (the end result is that I lose any vpn
  connections, as they don't seem to notice the restart, but that's
  another issue).

  In general use, I get periodic "wlp1s0: WPA: Group rekeying completed"
  messages in syslog (and used to get these in wily, too), but now,
  after a random amount of time (over the weekend it was several hours,
  this morning it was about 10 minutes, so it might be related to the
  amount of network traffic) I get "kernel: [13983.248157] wlp1s0:
  authenticate with 00:8a:ae:c9:9a:d8" (presumably my wifi router) and
  the usual wifi startup stuff including frequency lists, etc.

  It also always logs "systemd-udevd[30319]: Process '/sbin/crda' failed
  with exit code 249." every time (I'm not sure if this is relevant)

  After reading old, but similar bug reports, I've tried changing some
  of the module options: "11n_disable=1" and "11n_disable=8", but these
  had no effect.  I've also tried the older firmware that wily used
  (/lib/firmware/iwlwifi-7260-13.ucode), but again, no improvement.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-18-generic 4.4.0-18.34
  ProcVersionSignature: Ubuntu 4.4.0-18.34-generic 4.4.6
  Uname: Linux 4.4.0-18-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  chris      7058 F.... pulseaudio
   /dev/snd/controlC1:  chris      7058 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Mon Apr 18 09:01:26 2016
  HibernationDevice: RESUME=UUID=f92d915f-d552-4e5b-989d-70e936ce4f74
  InstallationDate: Installed on 2016-04-14 (3 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Beta amd64 (20160323)
  MachineType: LENOVO 20344
  ProcEnviron:
   LANGUAGE=en_GB:en
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_GB.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-18-generic.efi.signed root=/dev/mapper/ubuntu--vg-root ro noprompt quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-18-generic N/A
   linux-backports-modules-4.4.0-18-generic  N/A
   linux-firmware                            1.157
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 07/09/2014
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 96CN25WW(V1.11)
  dmi.board.asset.tag: 31900058WIN
  dmi.board.name: INVALID
  dmi.board.vendor: LENOVO
  dmi.board.version: 31900058WIN
  dmi.chassis.asset.tag: 31900058WIN
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Lenovo Yoga 2 13
  dmi.modalias: dmi:bvnLENOVO:bvr96CN25WW(V1.11):bd07/09/2014:svnLENOVO:pn20344:pvrLenovoYoga213:rvnLENOVO:rnINVALID:rvr31900058WIN:cvnLENOVO:ct10:cvrLenovoYoga213:
  dmi.product.name: 20344
  dmi.product.version: Lenovo Yoga 2 13
  dmi.sys.vendor: LENOVO

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