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[Uldis Kalniņš <1260825@xxxxxxxxxxxxxxxxxx>]

Try to rebuild kernel without USB3 support. This chipset is known unstable with it. This bug is pretty same to 
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1237296
Check with lsusb -t if affected device is bellow USB3 hub.

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https://bugs.launchpad.net/bugs/1260825

Title:
  168c:0032 ath3k built-in bluetooth cannot load firmware - sporadic

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  This is on an ASUS N550JV. Basically, the Bluetooth is sporadically
  available after restart/login. When not available, we get an error msg
  in dmesg about a patch that failed to load.

  $ sudo lsusb -v
  Bus 003 Device 016: ID 13d3:3402 IMC Networks
  Device Descriptor:
    bDeviceProtocol         1 Bluetooth
    idVendor           0x13d3 IMC Networks
    idProduct          0x3402
    bcdDevice            0.02
    iManufacturer           1 Atheros Communications
    iProduct                2 Bluetooth USB Host Controller
    iSerial                 3 Alaska Day 2006

  $ sudo lspci
  04:00.0 Network controller: Qualcomm Atheros AR9485 Wireless Network Adapter (rev 01)

  dmesg:
  [   13.663135] Bluetooth: Error in firmware loading err = -110,len = 448, size = 4096
  [   13.663173] Bluetooth: Loading patch file failed
  [   13.663198] ath3k: probe of 3-5:1.0 failed with error -110
  [   13.663229] usbcore: registered new interface driver ath3k

  Things already tried (to no much avail):
  - Update BIOS to latest version
  - Install "bluetooth" package
  - Enable ath9k bt coexistence (as per http://5thpeephole.blogspot.be/2013/10/install-ubuntu-1310-in-asus-n550jv.html)
  - unload / reload ath3k module:
  $ sudo modprobe -r ath3k; sleep 1; sudo modprobe ath3k

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: linux-firmware 1.116
  ProcVersionSignature: Ubuntu 3.11.0-14.21-generic 3.11.7
  Uname: Linux 3.11.0-14-generic x86_64
  ApportVersion: 2.12.5-0ubuntu2.1
  Architecture: amd64
  Date: Fri Dec 13 18:18:34 2013
  Dependencies:

  InstallationDate: Installed on 2013-12-07 (5 days ago)
  InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
  MarkForUpload: True
  PackageArchitecture: all
  SourcePackage: linux-firmware
  UpgradeStatus: No upgrade log present (probably fresh install)
  ---
  ApportVersion: 2.12.5-0ubuntu2.1
  Architecture: amd64
  Dependencies:

  DistroRelease: Ubuntu 13.10
  InstallationDate: Installed on 2013-12-07 (5 days ago)
  InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
  MarkForUpload: True
  Package: linux-firmware 1.116
  PackageArchitecture: all
  ProcVersionSignature: Ubuntu 3.11.0-14.21-generic 3.11.7
  Tags:  saucy
  Uname: Linux 3.11.0-14-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:
  ---
  ApportVersion: 2.12.5-0ubuntu2.1
  Architecture: amd64
  Dependencies:

  DistroRelease: Ubuntu 13.10
  InstallationDate: Installed on 2013-12-07 (5 days ago)
  InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
  MarkForUpload: True
  Package: linux-firmware 1.116
  PackageArchitecture: all
  ProcVersionSignature: Ubuntu 3.11.0-14.21-generic 3.11.7
  Tags:  saucy
  Uname: Linux 3.11.0-14-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:

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