Everything seemed to work on my new install of Debian Jessie on my new Toshiba C50D-B-120 except for Bluetooth. I noticed a warning during boot about some missing firmware, which wasn't mentioned during the install, unlike the network adapter firmware, which was.
However, using dmesg allowed me to see the error messages and track down the missing firmware.
First I tried installing firmware-atheros, but this doesn't have the firmware for the adapter in this computer.
To cut a long story short, the required files are
and they go in
They are available from
as described on the Ubuntu forum (thanks to Ephialta).
NB, the files go in /lib/firmware/ar3k/ in Debian and not in usr/lib/firmware/ar3k/ as described in the Ubuntu forum. Presumably that location applies to Ubuntu.
This information may be relevant to anybody who has the Qualcomm Atheros AR3012 adapter and has installed Linux, Googlebots please note.