I have researched similar problems, and have not had any success.
I've connected my Sony headsets over Blutooth. "HDMI" and "Headset" are both listed as outputs in the GUI sound settings. It seems HDMI is locked as the default, and clicking on "Headset" does open the option to change settings for Headset, neither can profiles be deleted. Note: My motherboard does not have Blutooth capabilities, so a Blutooth-USB is used.
Other solutions imply using the Terminal. I've listed the card profiles using
index 0 is "HDA ATI HDMI", alsa_card.pci-0000_01_00.1 index 1 is "HDA ATI SB", alsa_card_pci-0000_00_14.2 index 2 is the headset, bluez_card.[MAC address]
I then tried to set the index 2 card profile to 0.
pacmd set-card-profile 0 output:bluez_card.[MAC Address]
or (using the alias of the device)
pacmd set-card-profile 0 output:MDR-ZX330BT
etc. All commands generated "No such profile"
Next, I tried to set the default output:
pacmd set-defualt-source bluez_card.[MAC address]
again, "No Such Profile". Pressing tab after "set-default source" automatically gives three options, none of which are "bluez"
alsa_input_pci........analog-stereo alsa_input_pci........analog-stereo.monitor alsa_input_pci........hdmi-stereo.monitor
I know this is quite a mess, but any help is welcome.