Bluetooth [0cf3: 3004] немедленно отключается

Как только я включаю bluetooth из настроек gnome, он отключается.

[ 4241.696392] perf samples too long (2518 > 2500), lowering kernel.perf_event_max_sample_rate to 50000
[ 4306.801973] usb 2-1.4: new full-speed USB device number 8 using ehci-pci
[ 4311.900179] usb 2-1.4: New USB device found, idVendor=0cf3, idProduct=3004
[ 4311.900184] usb 2-1.4: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 4311.900186] usb 2-1.4: Product: Bluetooth USB Host Controller
[ 4311.900188] usb 2-1.4: Manufacturer: Atheros Communications
[ 4311.900189] usb 2-1.4: SerialNumber: Alaska Day 2006
[ 4320.440868] usb 2-1.4: USB disconnect, device number 8

Что здесь можно сделать? Какие команды shoul я пытаюсь выяснить?

$ dmesg | grep -i firmware; uname -a
[    1.509651] psmouse serio1: elantech: assuming hardware version 3 (with firmware version 0x350f00)
Linux laptop 3.13.0-77-generic #121-Ubuntu SMP Wed Jan 20 10:50:42 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

$ dmesg | grep ath3k
[   23.459930] usbcore: registered new interface driver ath3k
$ cat /etc/lsb-release 
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=14.04
DISTRIB_CODENAME=trusty
DISTRIB_DESCRIPTION="Ubuntu 14.04.3 LTS"