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["michael@xxxxxxxxxxxx" <michael@xxxxxxxxxxxx>]

I confirmed this *again* in a much easier way, by using the RF-toggle
switch to cycle the wifi manually on the laptop.

On 4.6, this makes the firmware crash (same error as above).

With the upgraded iwlwifi module and upgraded firmware, the error goes
away.

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https://bugs.launchpad.net/bugs/1577957

Title:
  Intel 7265D wifi firmware crashes on a Lenovo x1 carbon (3rd
  generation)

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  The stock firmware for this device /lib/firmware/iwlwifi-
  7265D-16.ucode is crashing.

  Downloading the latest firmware (/lib/firmware/iwlwifi-7265D-21.ucode)
  isn't supported by the existing iwlwifi driver, and so the driver
  likely needs to be upgraded (or downgraded as well
  (https://git.kernel.org/cgit/linux/kernel/git/iwlwifi/backport-
  iwlwifi.git/?h=release/LinuxCore18).

  I can also confirm that wifi *did* work successfully on 15.10 before
  upgrading to 16.04, although the kernel module required frequent
  restarts due to this bug:
  https://bugs.launchpad.net/ubuntu/xenial/+source/linux/+bug/1570595

  
  A detailed message about the firmware crash is located in the attachment from dmesg output.

  Thanks.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-21-generic 4.4.0-21.37
  ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
  Uname: Linux 4.4.0-21-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/pcmC1D0p:   mrhines    2419 F...m pulseaudio
   /dev/snd/controlC1:  mrhines    2419 F.... pulseaudio
   /dev/snd/controlC0:  mrhines    2419 F.... pulseaudio
  CurrentDesktop: KDE
  Date: Tue May  3 16:50:50 2016
  HibernationDevice: RESUME=UUID=1ac1f16c-161d-45c7-83b9-cecbbfdeee42
  InstallationDate: Installed on 2016-01-05 (119 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
  MachineType: LENOVO 20BSCTO1WW
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-21-generic.efi.signed root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-21-generic N/A
   linux-backports-modules-4.4.0-21-generic  N/A
   linux-firmware                            1.157
  SourcePackage: linux
  UpgradeStatus: Upgraded to xenial on 2016-04-21 (12 days ago)
  dmi.bios.date: 08/13/2015
  dmi.bios.vendor: LENOVO
  dmi.bios.version: N14ET32W (1.10 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20BSCTO1WW
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0J40709 WIN
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
  dmi.modalias: dmi:bvnLENOVO:bvrN14ET32W(1.10):bd08/13/2015:svnLENOVO:pn20BSCTO1WW:pvrThinkPadX1Carbon3rd:rvnLENOVO:rn20BSCTO1WW:rvrSDK0J40709WIN:cvnLENOVO:ct10:cvrNone:
  dmi.product.name: 20BSCTO1WW
  dmi.product.version: ThinkPad X1 Carbon 3rd
  dmi.sys.vendor: LENOVO

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