Bluetooth worked during several boots, now again not.
Seems to be a sporadic effect

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https://bugs.launchpad.net/bugs/1248500

Title:
  Atheros AR3012 cannot be turned up/is not recognized

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  lsusb -s 3:8
  Bus 003 Device 008: ID 0cf3:e004 Atheros Communications, Inc.
  dmesg
  [   22.302858] Bluetooth: Error in firmware loading err = -110,len = 448, 
size = 4096
  [   22.302865] Bluetooth: Loading patch file failed
  [   22.302871] ath3k: probe of 3-13:1.0 failed with error -110
  [   22.302900] usbcore: registered new interface driver ath3k
  --- 
  ApportVersion: 2.12.5-0ubuntu2.1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  wolfgang   2142 F.... pulseaudio
   /dev/snd/controlC2:  wolfgang   2142 F.... pulseaudio
   /dev/snd/controlC0:  wolfgang   2142 F.... pulseaudio
  DistroRelease: Ubuntu 13.10
  HibernationDevice: RESUME=UUID=f64f66e4-320f-417a-b25f-f7d9b8aed16d
  InstallationDate: Installed on 2013-11-02 (4 days ago)
  InstallationMedia: Kubuntu 13.10 "Saucy Salamander" - Release amd64 
(20131016.1)
  MachineType: Dell Inc. XPS 8700
  MarkForUpload: True
  NonfreeKernelModules: nvidia
  Package: linux (not installed)
  ProcFB: 0 EFI VGA
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-12-generic.efi.signed 
root=UUID=5577f2c6-030c-4234-b371-5b3dbf22b355 ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.11.0-12.19-generic 3.11.3
  RelatedPackageVersions:
   linux-restricted-modules-3.11.0-12-generic N/A
   linux-backports-modules-3.11.0-12-generic  N/A
   linux-firmware                             1.116
  RfKill:
   0: phy0: Wireless LAN
        Soft blocked: yes
        Hard blocked: no
  Tags:  saucy
  Uname: Linux 3.11.0-12-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  dmi.bios.date: 08/02/2013
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A03
  dmi.board.name: 0KWVT8
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 3
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: 
dmi:bvnDellInc.:bvrA03:bd08/02/2013:svnDellInc.:pnXPS8700:pvr:rvnDellInc.:rn0KWVT8:rvrA00:cvnDellInc.:ct3:cvr:
  dmi.product.name: XPS 8700
  dmi.sys.vendor: Dell Inc.

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