Intel wifi broken after resume

[Stéphane Graber]

After resume, wifi doesn't come back up, all wifi related commands take a long time before failing with input/output error.

Kernel log only seems to show some slowpaths being hit, but wifi sure isn't working here...

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.3.0-7-generic 4.3.0-7.18
ProcVersionSignature: Ubuntu 4.3.0-7.18-generic 4.3.3
Uname: Linux 4.3.0-7-generic x86_64
NonfreeKernelModules: zfs zunicode zcommon znvpair zavl
ApportVersion: 2.19.4-0ubuntu1
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC1: stgraber 2746 F.... pulseaudio
 /dev/snd/controlC0: stgraber 2746 F.... pulseaudio
Date: Thu Jan 28 14:37:03 2016
InstallationDate: Installed on 2015-04-23 (279 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
MachineType: LENOVO 20BXCTO1WW
ProcEnviron:
 LANGUAGE=en_CA:en
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_CA.UTF-8
 SHELL=/bin/bash
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.3.0-7-generic.efi.signed root=UUID=2a5a25ae-6bd9-40e1-8554-c38e0883a462 ro quiet splash swapaccount=1 vt.handoff=7
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
RelatedPackageVersions:
 linux-restricted-modules-4.3.0-7-generic N/A
 linux-backports-modules-4.3.0-7-generic N/A
 linux-firmware 1.155
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 03/10/2015
dmi.bios.vendor: LENOVO
dmi.bios.version: JBET47WW (1.12 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20BXCTO1WW
dmi.board.vendor: LENOVO
dmi.board.version: SDK0E50512 STD
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.modalias: dmi:bvnLENOVO:bvrJBET47WW(1.12):bd03/10/2015:svnLENOVO:pn20BXCTO1WW:pvrThinkPadT450s:rvnLENOVO:rn20BXCTO1WW:rvrSDK0E50512STD:cvnLENOVO:ct10:cvrNone:
dmi.product.name: 20BXCTO1WW
dmi.product.version: ThinkPad T450s
dmi.sys.vendor: LENOVO

[Stéphane Graber (stgraber)]

Unloading and loading iwlmvm and iwlwifi did the trick to fix this.

Last time I had that issue, I attempted to reload iwlmvm, but not iwlwifi too, maybe that made a difference this time.

[Emmanuel Grumbach (egrumbach)]

There are a number of issues.
Can you please record tracing of this?

I would also appreciate if you could open a bug on kernel.org. It would reduce the number of bug DBs I have to follow.

This is clearly a bug in the iwlwifi driver which I'd like to debug.

FWIW: I am the maintainer of that driver.

[Brad Figg (brad-figg)]

This change was made by a bot.

[Stéphane Graber (stgraber)]

I unfortunately can't reproduce this on demand. I've had it happen to me so far twice, both times immediately after resume, on two completely different wifi networks, once on a mobile hotspot from my phone and another time at a hotel in Brussels.

My best guess is that it's got to do with some network state at suspend time which then causes breakage on resume.

If I do find some kind of pattern that I can use to even vaguely reproduce this thing on request, then I'll definitely send you a trace.

[penalvch (penalvch)]

Stéphane Graber, as per http://support.lenovo.com/us/en/products/Laptops-and-netbooks/ThinkPad-T-Series-laptops/ThinkPad-T450s?linkTrack=Homepage:Body_Search%20Products&beta=true an update to your computer's buggy and outdated BIOS is available (1.20). If you update to this following https://help.ubuntu.com/community/BIOSUpdate does it change anything?

Once the BIOS is updated, if the problem is still reproducible:
1) Please provide the output of the following terminal command:
sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date
2) Please make a comment specifically advising on if there was an improvement or not.
3) Please mark this report Status Confirmed. If it's not reproducible, please mark this as Invalid.

Thank you for your understanding.

[Launchpad Janitor (janitor)]

[Expired for linux (Ubuntu) because there has been no activity for 60 days.]