Bluetooth (Atheros AR3012 0CF3:3004) does not work on Ubuntu 16.04

Question

Edit: This is on a fresh install of the OS.

Hardware details

Laptop

Lenovo Ideapad Z510

Kernel

Linux ip-z510 4.4.0-59-generic #80-Ubuntu SMP Fri Jan 6 17:47:47 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

Bluetooth

Atheros Communications, Inc. AR3012 Bluetooth 4.0 (0cf3:3004) (rev 00.02) [1]
Kernel modules in use: bnep,btbcm,btrtl,btusb,rfcomm,btintel [2]
Expected kernel module to use: ath3k [3]

WLAN [4]

Qualcomm Atheros AR9485 Wireless Network Adapter [168c:0032] (rev 01)
Subsystem: Lenovo AR9485 Wireless Network Adapter [17aa:3218]
Kernel driver in use: ath9k
Kernel modules: ath9k, wl

Sources

[1] usb-devices | awk '/3004/' RS=:

T:  Bus=03 Lev=01 Prnt=01 Port=06 Cnt=03 Dev#=  5 Spd=12  MxCh= 0
D:  Ver= 1.10 Cls=e0(wlcon) Sub=01 Prot=01 MxPS=64 #Cfgs=  1
P:  Vendor=0cf3 ProdID=3004 Rev=00.02
S:  Manufacturer=Atheros Communications
S:  Product=Bluetooth USB Host Controller
S:  SerialNumber=Alaska Day 2006
C:  #Ifs= 2 Cfg#= 1 Atr=e0 MxPwr=100mA
I:  If#= 0 Alt= 0 #EPs= 3 Cls=e0(wlcon) Sub=01 Prot=01 Driver=btusb
I:  If#= 1 Alt= 0 #EPs= 2 Cls=e0(wlcon) Sub=01 Prot=01 Driver=btusb

[2] I'm not sure how to ascertain which driver is in use. However, lsmod | grep -i bluetooth yields:

bluetooth             520192  29 bnep,btbcm,btrtl,btusb,rfcomm,btintel

[3]

• According to https://wireless.wiki.kernel.org/en/users/drivers/ath3k?s[]=ar3012, a combination of these files must be used, though I am not certain which ones would apply for my case:

  For AR3012, you can find the “AthrBT_0x01020200.dfu” and “ramps_0x01020200_26.dfu” or “ramps_0x01020200_40.dfu” on the linux-firmware git tree:
  git://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/ar3k/
  

• modinfo ath3k and modinfo ath3k | grep 3004 confirm my expectation:

  filename:       /lib/modules/4.4.0-59-generic/kernel/drivers/bluetooth/ath3k.ko
  firmware:       ath3k-1.fw
  license:        GPL
  version:        1.0
  description:    Atheros AR30xx firmware driver
  author:         Atheros Communications
  alias:          usb:v0CF3p3004d*dc*dsc*dp*ic*isc*ip*in*
  alias:          usb:v04CAp3004d*dc*dsc*dp*ic*isc*ip*in*
  

[4] lspci -knn | grep Net -A2:

09:00.0 Network controller [0280]: Qualcomm Atheros AR9485 Wireless Network Adapter [168c:0032] (rev 01)
    Subsystem: Lenovo AR9485 Wireless Network Adapter [17aa:3218]
    Kernel driver in use: ath9k
    Kernel modules: ath9k, wl

Additional notes/details:

• Loading ath3k on boot via /etc/modules OR via sudo modprobe ath3k does not make BT work. dmesg | tail only reports:

  [   17.178240] usbcore: registered new interface driver ath3k
  

• dmesg | grep -i blue:

  [    1.621634] usb 3-7: Product: Bluetooth USB Host Controller
  [   16.828268] Bluetooth: Core ver 2.21
  [   16.828279] Bluetooth: HCI device and connection manager initialized
  [   16.828282] Bluetooth: HCI socket layer initialized
  [   16.828284] Bluetooth: L2CAP socket layer initialized
  [   16.828288] Bluetooth: SCO socket layer initialized
  [   27.793692] usb 3-7: Product: Bluetooth USB Host Controller
  [   36.501132] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
  [   36.501134] Bluetooth: BNEP filters: protocol multicast
  [   36.501138] Bluetooth: BNEP socket layer initialized
  [   46.280055] Bluetooth: hci0 command 0x0c38 tx timeout
  [   48.284048] Bluetooth: hci0 command 0x0c39 tx timeout
  [   50.288051] Bluetooth: hci0 command 0x0c05 tx timeout
  [   50.739075] Bluetooth: RFCOMM TTY layer initialized
  [   50.739086] Bluetooth: RFCOMM socket layer initialized
  [   50.739090] Bluetooth: RFCOMM ver 1.11
  [   52.292034] Bluetooth: hci0 command 0x0c16 tx timeout
  

• rfkill list; hciconfig hci0; systemctl status bluetooth.service

  0: ideapad_wlan: Wireless LAN
      Soft blocked: no
      Hard blocked: no
  1: ideapad_bluetooth: Bluetooth
      Soft blocked: no
      Hard blocked: no
  2: phy0: Wireless LAN
      Soft blocked: no
      Hard blocked: no
  3: hci0: Bluetooth
      Soft blocked: no
      Hard blocked: no
  hci0:   Type: BR/EDR  Bus: USB
      BD Address: A4:DB:30:D1:E5:52  ACL MTU: 1022:8  SCO MTU: 183:5
      DOWN 
      RX bytes:904 acl:0 sco:0 events:38 errors:0
      TX bytes:392 acl:0 sco:0 commands:47 errors:9
  
  ● bluetooth.service - Bluetooth service
     Loaded: loaded (/lib/systemd/system/bluetooth.service; enabled; vendor preset: enabled)
     Active: active (running) since Sat 2017-01-21 13:37:47 IST; 39min ago
       Docs: man:bluetoothd(8)
   Main PID: 896 (bluetoothd)
     Status: "Running"
     CGroup: /system.slice/bluetooth.service
             └─896 /usr/lib/bluetooth/bluetoothd
  
  Jan 21 13:38:01 ip-z510 bluetoothd[896]: Endpoint registered: sender=:1.53 path=/MediaEndpoint/A2DPSink
  Jan 21 13:38:04 ip-z510 bluetoothd[896]: Failed to set mode: Failed (0x03)
  Jan 21 13:38:14 ip-z510 bluetoothd[896]: Failed to set mode: Failed (0x03)
  Jan 21 13:42:55 ip-z510 bluetoothd[896]: Endpoint unregistered: sender=:1.53 path=/MediaEndpoint/A2DPSource
  Jan 21 13:42:55 ip-z510 bluetoothd[896]: Endpoint unregistered: sender=:1.53 path=/MediaEndpoint/A2DPSink
  Jan 21 13:43:08 ip-z510 bluetoothd[896]: Failed to set mode: Failed (0x03)
  Jan 21 13:43:10 ip-z510 bluetoothd[896]: Endpoint registered: sender=:1.100 path=/MediaEndpoint/A2DPSource
  Jan 21 13:43:10 ip-z510 bluetoothd[896]: Endpoint registered: sender=:1.100 path=/MediaEndpoint/A2DPSink
  Jan 21 13:43:21 ip-z510 bluetoothd[896]: Failed to set mode: Failed (0x03)
  Jan 21 13:46:32 ip-z510 bluetoothd[896]: Failed to set mode: Failed (0x03)
  

Behavior

• The bluetooth icon may or may not load in the tray on login.
• The bluetooth toggle may or may not work.
• When the bluetooth toggle works, nothing is found on a search. Tried my phone and bluetooth audio.

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