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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