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[Launchpad Bug Tracker <1647826@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package linux-firmware - 1.161.1

---------------
linux-firmware (1.161.1) yakkety; urgency=medium

  * Trigger update-initramfs following linux-firmware install (LP: #1646197)
    - UBUNTU: Add postinst script to update initrds

  * Intel 8260 doesn't work with linux kernel 4.8 when using ucode version 22
    (LP: #1647826)
    - UBUNTU: SAUCE: Remove iwlwifi-8000C-22.ucode

 -- Seth Forshee <seth.forshee@xxxxxxxxxxxxx>  Tue, 06 Dec 2016 14:42:47
-0600

** Changed in: linux-firmware (Ubuntu Yakkety)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1647826

Title:
  intel 8260 doesn't work with linux kernel 4.8 when using ucode version
  22

Status in linux-firmware package in Ubuntu:
  Fix Committed
Status in linux-firmware source package in Xenial:
  Fix Committed
Status in linux-firmware source package in Yakkety:
  Fix Released
Status in linux-firmware source package in Zesty:
  Fix Committed

Bug description:
  The -22 microcode for the intel 8260 wifi adapter has compatibility
  issues with Linux Kernel 4.8 under certain hardware configurations.

  The iwlwifi module crashes resulting in wifi failing with "device not
  ready" and kernel errors reported in dmesg.

  [   10.691115] iwlwifi 0000:6e:00.0: Microcode SW error detected.
  Restarting 0x2000000.

  Renaming the ucode file at /lib/firmware/iwlwifi-8000C-22.ucode to
  fallback to the -21 ucode resolves the issue and wifi begins working
  normally again.

  This is an issue with Linux kernel 4.8 on both yakkety and xenial, so
  the bug doesn't currently affect users on xenial, but will begin to
  after the 16.04.2 HWE release.  Kernel 4.4 is unaffected because it
  doesn't attempt to use the -22 ucode

  The failure doesn't necessarily affect all machines of a given model
  with the 8260, but I can reproduce it on multiple laptops when 64GB of
  RAM are installed (4x16GB).  The RAM itself does not appear to be an
  issue.

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