Comment 52 for bug 1394368

Unfortunately, the fix for your card won't likely be included in Ubuntu 14.04 LTS.

You need to get those firmware files and put them in /lib/firmware/ar3k:
    - https://bugs.launchpad.net/ubuntu/+source/linux-lts-utopic/+bug/1462614/+attachment/4453553/+files/AthrBT_0x11020100.dfu
    - https://bugs.launchpad.net/ubuntu/+source/linux-lts-utopic/+bug/1462614/+attachment/4453554/+files/ramps_0x11020100_40.dfu

and get an updated driver for your kernel. Unfortunately, the dkms driver provided in https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1394368/comments/4 doesn't seem to work with kernel 3.13.