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[Roman <1525228@xxxxxxxxxxxxxxxxxx>]

I repeated my tests with a known AP with success!

It was an Asus RT-AC56U
Firmware Version: 3.0.0.4.378_4585
This site will propably contain all the information about the AP:
https://wikidevi.com/wiki/ASUS_RT-AC56U

The network i associated with is secured by WPA2.

** Attachment added: "related dmesg lines"
   https://bugs.launchpad.net/ubuntu/+source/linux-firmware/+bug/1525228/+attachment/4541789/+files/wifilog

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https://bugs.launchpad.net/bugs/1525228

Title:
  Qualcomm Atheros QCA61x4 cannot connect to encrypted 5Ghz networks

Status in linux-firmware package in Ubuntu:
  Incomplete

Bug description:
  The device works fine with Ubuntu 15.10 mainline kernel 4.2.0 and the
  firmware provided in linux-firmware on 2,4 Ghz wifi networks or
  unencrypted 5GHz networks.

  But when i connect to a encrypted 5Ghz network.  The firmware provide in linux-firmware (WLAN.RM.1.1-00141) crashed like i think is described here:
  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1516384

  So i installed the latest firmware release
  SW_RM.1.1.1-00157-QCARMSWPZ-1 from ath10k-firmware
  (https://github.com/kvalo/ath10k-firmware/)

  In this version the firmware doesn't crash but goes into a loop. Like
  you see in dmesg, the device associates with the AP, but from an
  unknown reason it cannot connect.

  At the moment i cannot provide you any details about the AP im testing
  with, because im using my universities network, but if you really need
  them i can test the device with an known AP in a week or so.

  I reported the bug to the ath10k mailing list, but i think the topic got lost:
  http://lists.infradead.org/pipermail/ath10k/2015-November/006478.html

  PS: I tested the problem with all mainline and upstream kernels(4.2.6,
  4.3.0,4.4rc4) without any difference.

  -----------------------------------------------------------------------------

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: linux-image-4.2.0-21-generic 4.2.0-21.25
  ProcVersionSignature: Ubuntu 4.2.0-21.25-generic 4.2.6
  Uname: Linux 4.2.0-21-generic x86_64
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  roman      2043 F.... pulseaudio
   /dev/snd/controlC1:  roman      2043 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Fri Dec 11 14:01:58 2015
  HibernationDevice: RESUME=UUID=38f2bb72-0ff3-498e-ab17-249df8b33aef
  InstallationDate: Installed on 2015-10-23 (49 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
  MachineType: Acer Aspire VN7-571G
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-21-generic.efi.signed root=UUID=da03328e-3129-4dfc-98d7-b8b06fa3d5f1 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-4.2.0-21-generic N/A
   linux-backports-modules-4.2.0-21-generic  N/A
   linux-firmware                            1.149.3
  SourcePackage: linux
  UdevLog: Error: [Errno 2] Datei oder Verzeichnis nicht gefunden: '/var/log/udev'
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 01/08/2015
  dmi.bios.vendor: Insyde Corp.
  dmi.bios.version: V1.14
  dmi.board.asset.tag: No Asset Tag
  dmi.board.name: Aspire VN7-571G
  dmi.board.vendor: Acer
  dmi.board.version: V1.14
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: Acer
  dmi.chassis.version: V1.14
  dmi.modalias: dmi:bvnInsydeCorp.:bvrV1.14:bd01/08/2015:svnAcer:pnAspireVN7-571G:pvrV1.14:rvnAcer:rnAspireVN7-571G:rvrV1.14:cvnAcer:ct10:cvrV1.14:
  dmi.product.name: Aspire VN7-571G
  dmi.product.version: V1.14
  dmi.sys.vendor: Acer

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