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[fichtenelch <1558252@xxxxxxxxxxxxxxxxxx>]

I'm also seeing the same problems running Ubuntu 16.04 on an Intel
NUC6i5SYK. I installed Ubuntu a couple of days ago starting with kernel
4.4.0-21-generic, here the wifi worked most of the time. Updating to
kernel 4.4.0-22-generic made this problem even worse. Now wifi doesn't
work at all, even after several reboots. Booting with the previous
kernel makes it work again...

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https://bugs.launchpad.net/bugs/1558252

Title:
  Intel 8260 / iwlwifi Occasionally unusuable after restart

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Hello,
  Some times my wifi card is inaccessible immediately after boot. Typically, restarting the machine or reloading the iwlwifi kernel module resolves the issue.

  dmesg on inaccessible card:

  [   13.146917] iwlwifi 0000:04:00.0: Unsupported splx structure
  [   13.147620] iwlwifi 0000:04:00.0: Direct firmware load for iwlwifi-8000C-19.ucode failed with error -2
  [   13.147754] iwlwifi 0000:04:00.0: Direct firmware load for iwlwifi-8000C-18.ucode failed with error -2
  [   13.147765] iwlwifi 0000:04:00.0: Direct firmware load for iwlwifi-8000C-17.ucode failed with error -2
  [   13.154952] iwlwifi 0000:04:00.0: loaded firmware version 16.242414.0 op_mode iwlmvm
  [   13.191912] iwlwifi 0000:04:00.0: Detected Intel(R) Dual Band Wireless AC 8260, REV=0x208
  [   13.198415] iwlwifi 0000:04:00.0: L1 Enabled - LTR Enabled
  [   13.199446] iwlwifi 0000:04:00.0: L1 Enabled - LTR Enabled
  [   13.200661] iwlwifi 0000:04:00.0: can't access the RSA semaphore it is write protected
  [   14.218185] iwlwifi 0000:04:00.0: SecBoot CPU1 Status: 0x3090003, CPU2 Status: 0x0
  [   14.218190] iwlwifi 0000:04:00.0: Failed to start INIT ucode: -110
  [   14.219090] iwlwifi 0000:04:00.0: Failed to run INIT ucode: -110
  [   14.219157] iwlwifi 0000:04:00.0: L1 Enabled - LTR Enabled

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-13-generic 4.4.0-13.29
  ProcVersionSignature: Ubuntu 4.4.0-13.29-generic 4.4.5
  Uname: Linux 4.4.0-13-generic x86_64
  ApportVersion: 2.20-0ubuntu3
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  ryan       1999 F.... pulseaudio
  Date: Wed Mar 16 12:00:48 2016
  HibernationDevice: RESUME=UUID=04e04e17-3976-4daa-a1dd-2dd369aee83d
  InstallationDate: Installed on 2015-09-21 (176 days ago)
  InstallationMedia: It
  IwConfig:
   enp0s31f6  no wireless extensions.
   
   lo        no wireless extensions.
  Lsusb:
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: LENOVO 20FNCTO1WW
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-13-generic root=/dev/mapper/it--vg-root ro quiet intel_pstate=no_hwp
  PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-13-generic N/A
   linux-backports-modules-4.4.0-13-generic  N/A
   linux-firmware                            1.156
  RfKill:
   0: tpacpi_bluetooth_sw: Bluetooth
   	Soft blocked: yes
   	Hard blocked: no
  SourcePackage: linux
  UpgradeStatus: Upgraded to xenial on 2016-02-24 (20 days ago)
  dmi.bios.date: 01/05/2016
  dmi.bios.vendor: LENOVO
  dmi.bios.version: R06ET33W (1.07 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20FNCTO1WW
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0J40697 WIN
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
  dmi.modalias: dmi:bvnLENOVO:bvrR06ET33W(1.07):bd01/05/2016:svnLENOVO:pn20FNCTO1WW:pvrThinkPadT460:rvnLENOVO:rn20FNCTO1WW:rvrSDK0J40697WIN:cvnLENOVO:ct10:cvrNone:
  dmi.product.name: 20FNCTO1WW
  dmi.product.version: ThinkPad T460
  dmi.sys.vendor: LENOVO

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