This bug was fixed in the package linux-oem - 4.13.0-1020.21

---------------
linux-oem (4.13.0-1020.21) xenial; urgency=low

  * linux-oem: 4.13.0-1020.21 -proposed tracker (LP: #1746017)

  [ Stefan Bader ]
  * Firmware upgrade interface for CAC Reader BCM58102 (LP: #1744041)
    - SAUCE: Support fw upgrade for CAC Reader BCM58102

  * the wifi driver is always hard blocked on a lenovo laptop (LP: #1743672)
    - ACPI: EC: Fix possible issues related to EC initialization order

  * ath9k can't connect to wifi AP (LP: #1727228)
    - ath9k: add MSI support
    - ath9k: add a quirk to set use_msi automatically

  * boot failure on AMD Raven + WesternXT (LP: #1742759)
    - SAUCE: drm/amdgpu: add atpx quirk handling (v2)

  * x86: CFL missing from early quirks (LP: #1742755)
    - drm/i915: add GT number to intel_device_info
    - drm/i915/kbl: Change a KBL pci id to GT2 from GT1.5
    - SAUCE: x86/gpu: add CFL to early quirks

  * [0cf3:e010] QCA6174A XR failed to pair with bt 4.0 device  (LP: #1741166)
    - Bluetooth: btusb: Add support for 0cf3:e010

  * QCA Rome bluetooth failed to work after applying reset-resume quirk
    (LP: #1741206)
    - Revert "Bluetooth: btusb: fix QCA Rome suspend/resume"
    - usb: quirks: Add reset-resume quirk for Dell DW1820 QCA Rome Bluetooth

  * [800 G3 SFF] [800 G3 DM]External microphone of headset(3-ring) is working,
    2-ring mic not working, both not shown in sound settings  (LP: #1740974)
    - ALSA: hda - Add MIC_NO_PRESENCE fixup for 2 HP machines

  * Two front mics can't work on a lenovo machine (LP: #1740973)
    - ALSA: hda - change the location for one mic on a Lenovo machine

  * No external microphone be detected via headset jack on a dell machine
    (LP: #1740972)
    - ALSA: hda - fix headset mic detection issue on a Dell machine

  *  Can't detect external headset via line-out jack on some Dell machines
    (LP: #1740971)
    - ALSA: hda/realtek - Fix Dell AIO LineOut issue

 -- Timo Aaltonen <timo.aalto...@canonical.com>  Mon, 29 Jan 2018
16:51:18 +0200

** Changed in: linux-oem (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

** Changed in: linux-oem (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1727228

Title:
  ath9k can't connect to wifi AP

Status in HWE Next:
  New
Status in linux-oem package in Ubuntu:
  Invalid
Status in linux-oem source package in Xenial:
  Fix Released

Bug description:
  [Impact]
  iwlist scan can search the available wifi APs, but can't get connected.

  On new Intel platforms like ApolloLake, legacy interrupt mechanism
  (INTx) is not supported, so WLAN modules are not working because
  interrupts are missing.

  The affected and listed platforms are
  Dell Inspiron 24-3460
  Dell Inspiron 14-3473
  Dell Inspiron 3472
  Dell Inspiron 3576
  Dell Vostro 3262
  Dell Vostro 15-3572
  Dell Vostro 3578

  [Fix]
  Qualcomm provided a MSI patch for ath9k, and it fixes the issue.

  [Test Case]
  Tested on the machines mentioned above, and they all work well.

  [Regression Potential]
  There shouldn't  be any regression potential. These are newly enabled 
machines and quirks are applied based on DMI_PRODUCT_NAME to only use MSI on 
such machines.

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