>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 ``` -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to pulseaudio in Ubuntu. https://bugs.launchpad.net/bugs/1871794 Title: [Bluetooth] No audio output/input in HSP/HFP mode Status in bluez package in Ubuntu: Confirmed Status in pulseaudio package in Ubuntu: Confirmed Bug description: I'm testing with Sony bluetooth headset SBH20, works fine in A2DP profile, but I can't get audio input and output work in HSP/HFP profile. [Reproduce steps] 1. Scan and pair BT headset in Bluetooth setting 2. Switch to HSP/HFP profile in Sound setting 3. Test sound output/input [Machine information] ProblemType: Bug DistroRelease: Ubuntu 20.04 Package: pulseaudio 1:13.99.1-1ubuntu1 ProcVersionSignature: Ubuntu 5.4.0-21.25-generic 5.4.27 Uname: Linux 5.4.0-21-generic x86_64 ApportVersion: 2.20.11-0ubuntu25 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: ubuntu 1359 F.... pulseaudio CurrentDesktop: ubuntu:GNOME Date: Thu Apr 9 16:26:52 2020 InstallationDate: Installed on 2020-04-09 (0 days ago) InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Beta amd64 (20200402) SourcePackage: pulseaudio Symptom: audio Symptom_Card: SBH20 Symptom_DevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: ubuntu 1359 F.... pulseaudio Symptom_Type: No sound at all Title: [SBH20, recording] No sound at all UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 09/17/2019 dmi.bios.vendor: Dell Inc. dmi.bios.version: 1.0.13 dmi.board.name: 0188D1 dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 31 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvr1.0.13:bd09/17/2019:svnDellInc.:pnXPS1373902-in-1:pvr:rvnDellInc.:rn0188D1:rvrA00:cvnDellInc.:ct31:cvr: dmi.product.family: XPS dmi.product.name: XPS 13 7390 2-in-1 dmi.product.sku: 08B0 dmi.sys.vendor: Dell Inc. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/bluez/+bug/1871794/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp