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

Alright, a BIOS upgrade didn't help. Still crashes.

More or less it consistently fails after a day or two, but I have
noticed that if I use the wifi continuously for a long work-day, and
never allow it to sleep or never switch to ethernet, the wifi stays
running.

So, the crashes do seem tied to powercycling the radio ----- either via
sleeping a few times throughout the day or by powering off the radio and
switching to ethernet. It can sometimes take multiple days of
powercycling the radio before it crashes ---- on the other hand, if I
have a lot of meetings one day and I cycle it frequently, then it
crashes within in a few hours.

If I avoid powercycling, the wifi (generally) seems to stay on. This
seems to indicate that there's some "buildup" of state in the firmware
that only happens after enough cycles to cause the firmware to either
not be keeping track of the actual state of the device or some kind of
memory corruption that only happens after enough cycling within the
firmware.

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

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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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