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[Po-Hsu Lin <po-hsu.lin@xxxxxxxxxxxxx>]

On this system, it seems that reboot could fix it temporarily. And it always not working with cold boot.
This could be probably an issue with Bluetooth under USB 3.0 hub
ubuntu@201401-14508:~$ lsusb -t
/:  Bus 04.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/2p, 5000M
/:  Bus 03.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/10p, 480M
    |__ Port 2: Dev 2, If 0, Class=Human Interface Device, Driver=usbhid, 1.5M
    |__ Port 2: Dev 2, If 1, Class=Human Interface Device, Driver=usbhid, 1.5M
    |__ Port 4: Dev 3, If 0, Class=Video, Driver=uvcvideo, 480M
    |__ Port 4: Dev 3, If 1, Class=Video, Driver=uvcvideo, 480M
    |__ Port 9: Dev 4, If 0, Class=Human Interface Device, Driver=usbhid, 12M
    |__ Port 10: Dev 5, If 0, Class=Wireless, Driver=, 12M
    |__ Port 10: Dev 5, If 1, Class=Wireless, Driver=, 12M
/:  Bus 02.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/2p, 480M
    |__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/6p, 480M
/:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/2p, 480M
    |__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/4p, 480M

However, running sudo apt-get dist-upgrade (3.16.0-39.53) could solve
this, I will mark this as Fix-released.

** Changed in: linux-lts-utopic (Ubuntu)
       Status: New => Fix Released

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https://bugs.launchpad.net/bugs/1478769

Title:
  [Dell Inspiron 3048]  Atheros Bluetooth [0fc3:e005] does not work with
  14.04.2 stock image

Status in linux-lts-utopic package in Ubuntu:
  Fix Released

Bug description:
  CID: 201401-14508 Dell Inspiron 3048 AIO

  The Atheros Bluetooth [0fc3:e005] on this system does not work with
  the 14.04.2 stock image (3.16 kernel)

  ubuntu@201401-14508:~$ dmesg | grep ath3
  [   16.724736] ath3k: probe of 3-10:1.0 failed with error -110
  [   16.724765] usbcore: registered new interface driver ath3k

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.16.0-30-generic 3.16.0-30.40~14.04.1 [modified: boot/vmlinuz-3.16.0-30-generic]
  ProcVersionSignature: Ubuntu 3.16.0-30.40~14.04.1-generic 3.16.7-ckt3
  Uname: Linux 3.16.0-30-generic x86_64
  NonfreeKernelModules: fglrx
  ApportVersion: 2.14.1-0ubuntu3.11
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Mon Jul 27 23:54:28 2015
  InstallationDate: Installed on 2015-06-10 (47 days ago)
  InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
  SourcePackage: linux-lts-utopic
  UpgradeStatus: No upgrade log present (probably fresh install)
  --- 
  ApportVersion: 2.14.1-0ubuntu3.11
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  ubuntu     1818 F.... pulseaudio
   /dev/snd/controlC0:  ubuntu     1818 F.... pulseaudio
  CRDA:
   country TW:
   	(2402 - 2472 @ 40), (3, 27)
   	(5270 - 5330 @ 40), (3, 17), DFS
   	(5735 - 5815 @ 40), (3, 30)
  CurrentDesktop: Unity
  DistroRelease: Ubuntu 14.04
  HibernationDevice: RESUME=UUID=882b2cfb-07ab-4ebb-8489-299eb67a2177
  InstallationDate: Installed on 2015-06-10 (47 days ago)
  InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
  MachineType: Dell Inc. Inspiron 20 Model 3048
  NonfreeKernelModules: fglrx
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-30-generic root=UUID=ddee19fc-2b93-4f6b-af84-ad752f1e523d ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.16.0-30.40~14.04.1-generic 3.16.7-ckt3
  RelatedPackageVersions:
   linux-restricted-modules-3.16.0-30-generic N/A
   linux-backports-modules-3.16.0-30-generic  N/A
   linux-firmware                             1.127.12
  RfKill:
   0: phy0: Wireless LAN
   	Soft blocked: no
   	Hard blocked: no
  Tags:  trusty
  Uname: Linux 3.16.0-30-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 02/06/2014
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: X23
  dmi.board.vendor: Dell Inc.
  dmi.chassis.type: 13
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrX23:bd02/06/2014:svnDellInc.:pnInspiron20Model3048:pvr01:rvnDellInc.:rn:rvr:cvnDellInc.:ct13:cvr:
  dmi.product.name: Inspiron 20 Model 3048
  dmi.product.version: 01
  dmi.sys.vendor: Dell Inc.

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