[Bluetooth] No audio output/input in HSP/HFP mode

[Gavin Lin]

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.

[Daniel van Vugt (vanvugt)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. This particular bug has already been reported and is a duplicate of bug 1576559, so it is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Feel free to continue to report any other bugs you may find.

[Daniel van Vugt (vanvugt)]

This is a duplicate of bug 1576559, even if the error and reason has changed over the years. Everyone experiencing this problem should be discussing it in the same bug.

[Rob Robertson (rob-rob)]

This is not a duplicate of bug 1576559. It is a duplicate of #1878194

[Daniel van Vugt (vanvugt)]

If that was true then bug 1878194 would be a duplicate of this one because this one is older.

[Javier Paniagua Laconich (jpaniagualaconich)]

Correct.
This is not a duplicate of #1576559.
#1878194 is a duplicate of this one.

But all the action is on #1878194, so let's make that one the original bug.

[Daniel van Vugt (vanvugt)]

It's not that much "action". We can make this the main bug...

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Fmstrat (fmstrat)]

I am getting the same issue with a new device. Everything works fine on one BT USB, but the intel one fails. It is a PCIe card with Intel AX200 Wifi+BT, with BT being passed through a USB header.

First boot with new card (dmesg):
```
[ 20.708957] Bluetooth: Core ver 2.22
[ 20.708971] Bluetooth: HCI device and connection manager initialized
[ 20.708974] Bluetooth: HCI socket layer initialized
[ 20.708975] Bluetooth: L2CAP socket layer initialized
[ 20.708978] Bluetooth: SCO socket layer initialized
[ 20.718527] usbcore: registered new interface driver btusb
[ 20.719034] Bluetooth: hci0: Bootloader revision 0.3 build 0 week 24 2017
[ 20.720327] Bluetooth: hci0: Device revision is 1
[ 20.720328] Bluetooth: hci0: Secure boot is enabled
[ 20.720329] Bluetooth: hci0: OTP lock is enabled
[ 20.720329] Bluetooth: hci0: API lock is enabled
[ 20.720330] Bluetooth: hci0: Debug lock is disabled
[ 20.720331] Bluetooth: hci0: Minimum firmware build 1 week 10 2014
[ 20.725091] Bluetooth: hci0: Found device firmware: intel/ibt-20-1-3.sfi
[ 21.839173] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[ 21.839174] Bluetooth: BNEP filters: protocol multicast
[ 21.839176] Bluetooth: BNEP socket layer initialized
[ 22.274234] Bluetooth: hci0: Waiting for firmware download to complete
[ 22.275022] Bluetooth: hci0: Firmware loaded in 1519998 usecs
[ 22.275058] Bluetooth: hci0: Waiting for device to boot
[ 22.289027] Bluetooth: hci0: Device booted in 13657 usecs
[ 22.289187] Bluetooth: hci0: Found Intel DDC parameters: intel/ibt-20-1-3.ddc
[ 22.290032] Bluetooth: hci0: Failed to send Intel_Write_DDC (-22)
[ 35.565521] Bluetooth: RFCOMM TTY layer initialized
[ 35.565525] Bluetooth: RFCOMM socket layer initialized
[ 35.565527] Bluetooth: RFCOMM ver 1.11
```

Next boot:
```
[ 19.608303] Bluetooth: Core ver 2.22
[ 19.608315] Bluetooth: HCI device and connection manager initialized
[ 19.608318] Bluetooth: HCI socket layer initialized
[ 19.608319] Bluetooth: L2CAP socket layer initialized
[ 19.608321] Bluetooth: SCO socket layer initialized
[ 19.616842] usbcore: registered new interface driver btusb
[ 19.617945] Bluetooth: hci0: Firmware revision 0.0 build 128 week 11 2020
[ 20.872710] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[ 20.872711] Bluetooth: BNEP filters: protocol multicast
[ 20.872714] Bluetooth: BNEP socket layer initialized
[ 34.561042] Bluetooth: RFCOMM TTY layer initialized
[ 34.561048] Bluetooth: RFCOMM socket layer initialized
[ 34.561050] Bluetooth: RFCOMM ver 1.11
```

`lsusb -v`:
```
Bus 003 Device 003: ID 8087:0029 Intel Corp.
Device Descriptor:
  bLength 18
  bDescriptorType 1
  bcdUSB 2.01
  bDeviceClass 224 Wireless
  bDeviceSubClass 1 Radio Frequency
  bDeviceProtocol 1 Bluetooth
  bMaxPacketSize0 64
  idVendor 0x8087 Intel Corp.
  idProduct 0x0029
  bcdDevice 0.01
  iManufacturer 0
  iProduct 0
  iSerial 0
  bNumConfigurations 1
  Configuration Descriptor:
    bLength 9
    bDescriptorType 2
    wTotal...

[Fmstrat (fmstrat)]

I should also note, if it helps, that when this BT device is installed on the system, using the hotkeys to adjust volume on my keyboard no longer works.

[Hui Wang (hui.wang)]

@Fmstrat,

In your case, It looks like the driver for BT module on AX200 or the firmware intel/ibt-20-1-3.sfi has some problem, could yo please submit this bug to upstream

[yossisynett (yossisynett)]

@hui.wang, how do we submit the bug to upstream?

[Executenor (nicktelindert)]

I found out what the problem is, the wrong firmware gets loaded. It load the firmware for the ax201 instead of ax200.

[Hui Wang (hui.wang)]

@Executenor,

what firmware is for ax201 and what firmware is for ax200?

thx.

[Executenor (nicktelindert)]

version 48 is for AX201 AND version 46 is for ax200.

[Hui Wang (hui.wang)]

Thansk, the hardware ax200 will load ibt-20-1-3.ddc and ibt-20-1-3.sfi, do you mean the ibt-20-1-3 is version 48 or the ibt-20-1-3 has version 46 and 48?

[Executenor (nicktelindert)]

I booted up my laptop today and hsp/hfp mode failed again. So my idea about the firmware seems to be wrong. So i was wrong about that.

[Executenor (nicktelindert)]

I booted a live image of 20.10 and their my bluetooth does work. I also downloaded a version of 20.04.1 which also worked fine.

[Executenor (nicktelindert)]

I have got it working with the liquorix kernel and updated firmware, the biggest issue seems to be that the ibt firmware does not get loaded.

[yossisynett (yossisynett)]

Thanks for the tip, also got this working with the liquorix kernel but didn't have to update the firmware - used the current version in ubuntu 20.04

[Executenor (nicktelindert)]

After booting the liquorix kernel the normal kernel started working too. Although with updated firmware. The difference is that the firmware is loading while before it didn't load at all.

[tim474 (tim474)]

Same problem, liquorix didn't help.

```
$ sudo dmesg | grep blue -i
[ 18.829608] Bluetooth: Core ver 2.22
[ 18.829633] Bluetooth: HCI device and connection manager initialized
[ 18.829638] Bluetooth: HCI socket layer initialized
[ 18.829641] Bluetooth: L2CAP socket layer initialized
[ 18.829645] Bluetooth: SCO socket layer initialized
[ 18.951265] Bluetooth: hci0: Bootloader revision 0.0 build 0 week 30 2018
[ 18.952080] Bluetooth: hci0: Device revision is 2
[ 18.952082] Bluetooth: hci0: Secure boot is enabled
[ 18.952083] Bluetooth: hci0: OTP lock is enabled
[ 18.952084] Bluetooth: hci0: API lock is enabled
[ 18.952085] Bluetooth: hci0: Debug lock is disabled
[ 18.952086] Bluetooth: hci0: Minimum firmware build 1 week 10 2014
[ 18.955123] Bluetooth: hci0: Found device firmware: intel/ibt-19-0-0.sfi
[ 20.470860] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[ 20.470862] Bluetooth: BNEP filters: protocol multicast
[ 20.470879] Bluetooth: BNEP socket layer initialized
[ 20.480262] Bluetooth: hci0: Waiting for firmware download to complete
[ 20.481072] Bluetooth: hci0: Firmware loaded in 1494799 usecs
[ 20.481147] Bluetooth: hci0: Waiting for device to boot
[ 20.495259] Bluetooth: hci0: Device booted in 13804 usecs
[ 20.495772] Bluetooth: hci0: Found Intel DDC parameters: intel/ibt-19-0-0.ddc
[ 20.496201] Bluetooth: hci0: Failed to send Intel_Write_DDC (-22)
[ 20.498169] Bluetooth: hci0: Firmware revision 0.0 build 128 week 11 2020
[ 23.936736] Bluetooth: RFCOMM TTY layer initialized
[ 23.936747] Bluetooth: RFCOMM socket layer initialized
[ 23.936753] Bluetooth: RFCOMM ver 1.11
```

Headset Afresshokz Air.

It works as HSP on Fedora with kernel 5.6

[tim474 (tim474)]

Bluetooth device is 8087:0aaa

HSP works on the same device with ubuntu 18.04 with OEM kernel (as I remember 5.0)

[tim474 (tim474)]

PLEASE HELP!!! ANY WORKAROUND PLEASE!!!

[tim474 (tim474)]

It seems that I have found the workaround. I copied /lib/firmware/intel/ibt* from ubuntu 18.04 to 20.04

[lima (lima25)]

Above workaround with older ibt* files does not work on Ubuntu 20.04.1 LTS on Elitebook 840 G6, Bluetooth devices:
Samsung HM1350
Sony WH-CH700N

[Iain (ironpants)]

HSP/HFP does not work on Ubuntu 20.04 with Sony WI-1000X. A2DP does work (output) but as soon as I switch to HSP/HFP then I loose bluetooth audio (input and output). Ran Ubuntu 18.04 from a live USB and HSP/HFP did work so something has changed between 18.04 and 20.04.

[newsworthy39 (newsworthy39)]

Same problem here, Sone WH-1000MX2, ubuntu 20.04.1 LTS, Linux 5.4.0-45-generic. AD2P works, however as soon as i switch to HSP/HFP then i loose bluetooth audio. Worked in Ubuntu 18 LTS.

[Executenor (nicktelindert)]

I use a Sony WH-1000MX2 too, and after an update my bluetooth broke again.

[Executenor (nicktelindert)]

https://bugs.launchpad.net/ubuntu/+source/bluez/+bug/1879615

This one is related

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Luke Renaud (luke-renaud)]

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
```

[Roman Gralevsky (rgralevsky)]

Sennheiser Momentum True Wireless 2

[Roman Gralevsky (rgralevsky)]

Affecting me as well

[Leendert de Kok (koktail)]

I can confirm this behavior with by JBL TUNE750TNC.

[Leendert de Kok (koktail)]

Any information needed about my configuration or some log?

[Dominic Swaine (domswaine)]

Affected by this also.

[davebenvenuti (davebenvenuti)]

Affects me as well on Kubuntu 20.04

[Christian Baumann (wurzelserver)]

Affects me as well on Ubuntu 20.04 and DELL Latitude 5310

[Ilya (d1313)]

+ same here
20.04 LTS clean install XPS9500 + MPOW336A

[smurf (luca-dgh)]

@Hui Wang,
about the new driver in git repository.
I downloaded the source and compiled it, but the readme file is empty and I don't know the steps to install it and insert in dkms. I wrote an issue for this in git repository.
Could you help me?

[Hui Wang (hui.wang)]

@smurf,

What is generated after building? If it is *.deb file, just need to run 'sudo dpkg -i *.deb; reboot'

[Raknu (santiago-azpiazu)]

Also solved upgrading from 20.04LTS to 20.10.
I have a JBL TUNE500BT working now.

[smurf (luca-dgh)]

@Hui Wang,
no is not a package, the Make generated *.so or something like that

[smurf (luca-dgh)]

Please please, I'll apreciate a lot any kind of help.

[Michael Heller (chusti)]

Nice to see it works for 20.10.
however, I'd like to keep on the LTS version and expect to get a fix soon.

[Anton Viktorov (latonita)]

ubuntu 20.04, kernel Linux 5.4.0-52-generic
samsung galaxy buds, cant switch to hsp/hfp
thinkpad x1 carbon. laptop has intel BT 8087:0a2b,
/lib/firmware/intel/ibt-12-16.sfi is used.

tried to get "new" from here https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/tree/intel but it has same fw file as i have on my system

[smurf (luca-dgh)]

Ok, I upgraded to 20.10, but in my case there are no changes, I see exactly the same behavior than in 20.04 .
I would appreciate a lot a bit of help.

[Hui Wang (hui.wang)]

@smurf,

I heard this wifi+bt module needs to install a dkms. I will ask my colleague about it.

[Hui Wang (hui.wang)]

@smurf,

My colleague told me that: sudo apt install rtl8821ce-dkms;reboot

if it doesn't work, you could remove it by sudo dpkg -P

[smurf (luca-dgh)]

@Hui Wang
Thank you so much for your help.
Unfortunately now I got another problem. I upgraded to Ubuntu 20.10 with kernel 5.8.0-28 and now the driver doesn't compile, there is a fatal error, on 20.04 with kernel 5.4.0.53 there was no errors.
I opened an issue here https://github.com/rtlwifi-linux/rtlwifi-next/issues/18 , but honestly I don't know if someone reads that forum.

[Hui Wang (hui.wang)]

The Intel bluetooth firmware will be upgraded with this bug #1905214

[Kenneth Koski (knkski)]

Thanks @hui.wang. Upgrading to Groovy didn't fix the issue for me with an AX200 card, but installing rtl8821ce-dkms made it work great.

[smurf (luca-dgh)]

@Hui Wang
sudo apt install rtl8821ce-dkms didn't the magic in my case.
hsp/hfp is still not working. I disabled Secure Boot on my laptop, I hope is not a problem.

[Hui Wang (hui.wang)]

@smurf,

after you change to hsp/hfp mode and it fails, please run hciconfig -a > hcilog.txt and upload it.

[smurf (luca-dgh)]

@Hui Wang
hsp/hfp mode doesn't fail, because it can't be activated.
In Blueman it says that it's impossible to switch the profile.
In Pulseaudio I have no options.

[smurf (luca-dgh)]

Anyway, this is the output of hciconfig -a after I tried to switch to hsp/hfp mode from BlueMan Manager.

hci0: Type: Primary Bus: USB
 BD Address: 5C:BA:EF:99:BC:3C ACL MTU: 1021:6 SCO MTU: 255:12
 UP RUNNING
 RX bytes:2950504 acl:61 sco:0 events:421151 errors:0
 TX bytes:259267232 acl:420944 sco:0 commands:188 errors:0
 Features: 0xff 0xff 0xff 0xfe 0xdb 0xfd 0x7b 0x87
 Packet type: DM1 DM3 DM5 DH1 DH3 DH5 HV1 HV2 HV3
 Link policy: RSWITCH HOLD SNIFF PARK
 Link mode: SLAVE ACCEPT
 Name: 'RTK_BT_5.0'
 Class: 0x000000
 Service Classes: Unspecified
 Device Class: Miscellaneous,
 HCI Version: 5.1 (0xa) Revision: 0xc
 LMP Version: 5.1 (0xa) Subversion: 0x8822
 Manufacturer: Realtek Semiconductor Corporation (93)

[smurf (luca-dgh)]

I had to reinstall Ubuntu 20.04 with kernel 5.4.0-56 because on 20.10 with kernel 5.8.0-28 the wifi was very unstable.

[Jonah Libster (jalibsterattucows)]

Cannot use Microphone at all because when I switch to HSP/HSF mode the Microphone has no input and the speakers stop working. I tried installing Ofono which resulted in the Microphone working as a "speaker" (got sound levels) and the speakers not working at all when attempting to use HSP/HSF mode.Here are the hardware/Os basic details.

Ubuntu 20.0.4.1 LTS
Lenovo 20QU-S4RC00
Plantronics BackBeat Pro 2

[Sherebyah Tisbi (sherebiahtishbi)]

Confirm this issue with my Logitech H800 headset and also with Bose Mini II Soundlink. I hear audio successfully on both devices irrespective of A2DP or HSP/HSF. But microphone doesn't work on either mode.

[Vedprakash Upraity (vedupraity)]

I am facing the same problem with Ubuntu 20.04.1 LTS, using Sennheiser HD450 BT. I can switch between A2DP and HSP profiles, A2DP works great for music. When I switch to HSP, it reduces audio quality and sounds like a telephone and the mic is not working at all.

[Michael Heller (chusti)]

Problem has been fixed for my setup:

- Kernel: 5.4.0-56-generic
- OS: Xubuntu 20.04.01 LTS
- Machine: HP-ZBook-14u-G6
- Headset: FreeVoice Space Stereo

[denis (shingitsune)]

Problem has NOT been fixed for my setup:

- Kernel: 5.4.0-58.64-generic
- OS: Ubuntu 20.04.1 LTS
- Machine: Dell Inspiron 7559 (0706)
- Headset: Anker Soundcore Liberty Air 2

[Gustave Coste (gustavecoste)]

Problem has NOT been fixed for my setup:

- Kernel: 5.4.0-65-generic
- OS: Ubuntu 20.04.1 LTS
- Machine: Dell EliteBook
- Headset: Oppo Enco Quiet

[Patrick Banholzer (patrick-banholzer)]

Problem remains, my environment:

 - Kernel: 5.4.0-65-generic
 - OS: Ubuntu 20.04.2 LTS
 - Machine: Dell Precision 5550
 - Headset: Jabra Evolve 75

Couple of users facing the same issue here.

[Manuel Torrinha (t0rrant)]

Problem remains, my environment:

 - Kernel: 5.8.0-43-generic
 - OS: Ubuntu 20.04.2 LTS
 - Machine: Dell Latitude 7410
 - Headset: Mi TW Earphones 2 Basic

[Stefan W (s-witzel)]

Same problem:

- Kernel: 5.8.0-41-generic
- OS: Ubuntu 20.04.02 LTS
- Headset: Sennheiser MB Pro 2

I can switch to HSP but even audio output won't work at all.

[Luis (luisvillamarin)]

Issue:

- I can switch profiles, but when I chose HSP/HFP I get no sound and the microphone doesn't work.
- I didn't have this issue in 18.04 LTS or 16.04 LTS (same hardware)

Environment:

- Kernel: Linux 5.8.0-44-generic
- OS: Ubuntu 20.04.1 LTS
- Headset: WC-CH500
- BT Dongle: Plugable USB Bluetooth 4.0

[Paolo Ranzi (paoloranzi81)]

I have the same issue with the headphone's microphone. My Bose 700 connects and has sound output for A2DP, but terrible audio quality (HSP/HFP) when switching on headphone's microphone.

Laptop: Acer Predator G9 591 2016
OS: Ubuntu 20.04.01 LTS
Kernel: 5.4.0-66-generic
Headset: Bose 700

[Nazzareno Marziale (nenzius)]

Same problem.
Linux 5.8.0-45-generic #51-Ubuntu SMP Fri Feb 19 13:24:51 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
DELL XPS 15 9570

[Alex Huang (al3xh)]

Problem has NOT been fixed for my setup either:

- Kernel: 5.9.6-050906-generic
- OS: Ubuntu 20.04.1 LTS
- Machine: Custom built PC?
- Headset: Apple Airpods pro

I was able to have a workaround by following this answer and setting up ofono: https://askubuntu.com/a/1236379/295477. However, I expected it to work out of the box...

[Juan Leni (jleni)]

Any updates on this?

[Artem (aplaksiy)]

Same problem:
- Kernel: 5.8.0-50-generic
- OS: Ubuntu 20.04.1
- Machine: HP EliteBook 830 G6
- Headset: BUXTON BHP 7501

[Birender Singh (mebirendersingh)]

Sorry @~gavin.lin, by mistake marked released.
Please fix it at youe end.

[David Rincon (rinkond)]

Same problem here
Ubuntu 20.04
kernel 5.8.0-53-generic

[smurf (luca-dgh)]

Problem fixed for me on Ubuntu 20.04 after Kernel upgrade to 5.4.0-74.
But the quality of sound (in and out) is really poor.

[Gaz (gazd)]

Until this is resolved try working around it by replacing PulseAudio with pipewire. Works well with my Bose 700 headset.

[Pham Quoc Hung (2411-phamquochung)]

Same issue for me. Bluetooth is one of the most annoying issues on Linux.
- OS: Ubuntu 20.04.1 LTS
- Kernel: 5.4.0-80-generic
- Machine: Dell precision M4700
- Headset: Sony WH-CH510

[_kai_ (gpayo)]

Same issue for me: A2DP sink, sound is clear. If it set it as HFP, no sound and no mic.

Also I notice that the main volume control doesn't affect the volume (it remains the same and I have to change the volume by using the minus/plus in the device)

PipeWire didn't solve my issue.

- OS: Ubuntu 21.10
- Kernel: 5.13.0-22-generic #22-Ubuntu SMP
- Headset: Tribit MaxSound Plus
- BT dongle: Cambridge Silicon Radio, Ltd Bluetooth Dongle (HCI mode)

[AlberT (dralbert)]

Same issue here.

  - HW: Lenovo ThinkPad X1 Carbon Gen 10
  - HeadSet: Sennheiser 4.50BTNC
  - OS: Ubuntu 22.04.1 LTS (Jammy Jellyfish)
  - BT fw: intel/ibt-0040-0041.sfi
  - Kernel: 5.15.0-52-generic #58-Ubuntu SMP

If high quality output is selected no input channel is available. To be able to use the headphones mic one has to use the mono channel output ...