>From what I can gather this is not a function of the headset or
Bluetooth device, but it's a function of firmware differences in the
host side Bluetooth adapters.
For example, I have a Sony WH-1000MX3.
I have a USB dongle adapter that does not work in the HSP/HFP mode. When
selecting the mode the active profile throws various errors then returns
to the "off" PulseAudio/ALSA profile.
lsusb on the CSR USB dongle.
```
Bus 001 Device 003: ID 0a12:0001 Cambridge Silicon Radio, Ltd Bluetooth Dongle
(HCI mode)
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 224 Wireless
bDeviceSubClass 1 Radio Frequency
bDeviceProtocol 1 Bluetooth
bMaxPacketSize0 64
idVendor 0x0a12 Cambridge Silicon Radio, Ltd
idProduct 0x0001 Bluetooth Dongle (HCI mode)
bcdDevice 88.91
iManufacturer 0
iProduct 2
iSerial 0
bNumConfigurations 1
```
I also have an Intel Bluetooth/WiFi 802.11ac card (Bluetooth is on the
USB bus), that does support the HSP/HFP mode, abet with noticeably
reduced audio quality. I think there is a separate bug in launchpad
tracking the audio quality issues of that mode though.
header for `lsusb -v` on the Intel card.
```
Bus 001 Device 005: ID 8087:07dc Intel Corp.
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 224 Wireless
bDeviceSubClass 1 Radio Frequency
bDeviceProtocol 1 Bluetooth
bMaxPacketSize0 64
idVendor 0x8087 Intel Corp.
idProduct 0x07dc
bcdDevice 0.01
iManufacturer 0
iProduct 0
iSerial 0
bNumConfigurations 1
```
lspci on the intel card
```
04:00.0 Network controller: Intel Corporation Wireless 7260 (rev 73)
Subsystem: Intel Corporation Dual Band Wireless-AC 7260
Flags: bus master, fast devsel, latency 0, IRQ 96
Memory at f7600000 (64-bit, non-prefetchable) [size=8K]
Capabilities: <access denied>
Kernel driver in use: iwlwifi
Kernel modules: iwlwifi
```
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https://bugs.launchpad.net/bugs/1871794
Title:
[Bluetooth] No audio output/input in HSP/HFP mode
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