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[Seth Forshee <seth.forshee+lp@xxxxxxxxxxxxx>]

** Also affects: linux-firmware (Ubuntu Artful)
   Importance: Medium
     Assignee: Seth Forshee (sforshee)
       Status: Confirmed

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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:
  Confirmed
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
Status in linux-firmware source package in Artful:
  Confirmed

Bug description:
  SRU Justification

  Impact: The -22 firmware for iwlwifi introduces regressions with some
  hardware versus earlier firmware versions. As no newer firmware is
  available, the only fix is to revert back to the older firmware which
  does work.

  Test Case: Using the -22 firmware with affected hardware produces the
  behavior described below. The -21 firmware does not.

  Regression Potential: Switching back to -21 could cause some
  regressions with other hardware supported by this firmware. However as
  -22 causes some hardware to completely fail to work any regressions
  are almost certain to be less severe than the current problems.

  ---

  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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