*** This bug is a duplicate of bug 1871794 ***
https://bugs.launchpad.net/bugs/1871794
Maybe different machines have different root cause for this issue, for
my case:
I have 3 laptops: 1 dell laptop with intel BT 8087:0aaa, 1 dell laptop
with Atheros BT 0cf3:e007 and 1 lenovo laptop with intel BT 8087:0029. I
have 4 BT headsets: 1 QC35 II, 1 harman kardon soho wireless, 1 sony wl-
1000x and 1 plantronics Go2.
After freshly installing the ubuntu 20.04, those 4 headsets work well on
both Dell laptops, in the hsp/hfp mode, both playback and recording work
well.
But on the Lenovo machine, I reproduced the issue, all headsets could
work in A2DP mode, couldn't output and record in hsp/hfp mode.
I ran $sudo btmon, found after switch to Synchronous connection
successfully (HCI Event: Synchronous Connect Complete), the dell
machines could receive the sco packets from headsets, while the lenovo
machine couldn't. The difference between Lenovo and Dell machines is
they have different BT host controllers. Then I debugged the bt kernel
driver, found on that lenovo machine, the btusb driver could not receive
the usb_isoc packets from headsets (length always equals 0).
So on my LENOVO laptop, it is highly possible this is a kernel driver or
BT firmware/WiFi firmware's bug.
So if possible, you could plug in an external USB BT dongle to redo the
test, let headsets connect to that dongle instead of BT hci on your
laptop. Or you could run sudo btmon to check the log, if it is a
synchronous connection failure or TX/RX on SCO packets failure.
This is a example log captured on my Dell machine (without hsp/hfp
issue), starting capture when manually switch to hsp/hfp mode:
Bluetooth monitor ver 5.48
= Note: Linux version 5.3.0-56-generic (x86_64)
0.694655
= Note: Bluetooth subsystem version 2.22
0.694662
= New Index: 18:1D:EA:86:BE:E6 (Primary,USB,hci0)
[hci0] 0.694666
= Open Index: 18:1D:EA:86:BE:E6
[hci0] 0.694667
= Index Info: 18:1D:EA:86:BE:E6 (Intel Corp.)
[hci0] 0.694668
@ MGMT Open: bluetoothd (privileged) version 1.14
{0x0002} 0.694673
@ MGMT Open: bluetoothd (privileged) version 1.14
{0x0001} 0.694674
@ MGMT Open: btmon (privileged) version 1.14
{0x0003} 0.694731
< HCI Command: Exit Sniff Mode (0x02|0x0004) plen 2
#1 [hci0] 6.574419
Handle: 256
> HCI Event: Command Status (0x0f) plen 4
>
> #2 [hci0] 6.688939
Exit Sniff Mode (0x02|0x0004) ncmd 1
Status: Success (0x00)
> HCI Event: Mode Change (0x14) plen 6
>
> #3 [hci0] 6.829008
Status: Success (0x00)
Handle: 256
Mode: Active (0x00)
Interval: 0.000 msec (0x0000)
< HCI Command: Setup Synchronous Connection (0x01|0x0028) plen 17
#4 [hci0] 6.829108
Handle: 256
Transmit bandwidth: 8000
Receive bandwidth: 8000
Max latency: 10
Setting: 0x0060
Input Coding: Linear
Input Data Format: 2's complement
Input Sample Size: 16-bit
# of bits padding at MSB: 0
Air Coding Format: CVSD
Retransmission effort: Optimize for power consumption (0x01)
Packet type: 0x0380
3-EV3 may not be used
2-EV5 may not be used
3-EV5 may not be used
> HCI Event: Command Status (0x0f) plen 4
>
> #5 [hci0] 6.830016
Setup Synchronous Connection (0x01|0x0028) ncmd 1
Status: Success (0x00)
> HCI Event: Max Slots Change (0x1b) plen 3
>
> #6 [hci0] 6.834999
Handle: 256
Max slots: 1
> HCI Event: Synchronous Connect Complete (0x2c) plen 17
>
> #7 [hci0] 6.917015
Status: Success (0x00)
Handle: 257
Address: 48:C1:AC:D1:18:12 (PLANTRONICS, INC.)
Link type: eSCO (0x02)
Transmission interval: 0x0c
Retransmission window: 0x02
RX packet length: 60
TX packet length: 60
Air mode: CVSD (0x02)
> SCO Data RX: Handle 0 flags 0x00 dlen 48
>
> #8 [hci0] 6.919960
> ACL Data RX: Handle 256 flags 0x02 dlen 20
>
> #9 [hci0] 6.924559
Channel: 64 len 16 [PSM 0 mode 0] {chan 0}
63 ff 14 00 01 41 54 2b 56 47 53 3d 31 35 0d 12 c....AT+VGS=15..
> HCI Event: Max Slots Change (0x1b) plen 3
>
> #10 [hci0] 6.926005
Handle: 256
Max slots: 5
< SCO Data TX: Handle 257 flags 0x00 dlen 48
#11 [hci0] 6.926474
< ACL Data TX: Handle 256 flags 0x00 dlen 19
#12 [hci0] 6.927142
Channel: 88 len 15 [PSM 0 mode 0] {chan 0}
61 ef 17 0d 0a 2b 56 47 4d 3d 31 35 0d 0a d4 a....+VGM=15...
< ACL Data TX: Handle 256 flags 0x00 dlen 14
#13 [hci0] 6.927574
Channel: 88 len 10 [PSM 0 mode 0] {chan 0}
61 ef 0d 0d 0a 4f 4b 0d 0a d4 a....OK...
> SCO Data RX: Handle 0 flags 0x00 dlen 48
>
> #14 [hci0] 6.929969
> SCO Data RX: Handle 0 flags 0x00 dlen 48
>
> #15 [hci0] 6.929976
> SCO Data RX: Handle 0 flags 0x00 dlen 48
>
> #16 [hci0] 6.929977
> HCI Event: Number of Completed Packets (0x13) plen 5
>
> #17 [hci0] 6.931993
Num handles: 1
Handle: 256
Count: 1
> HCI Event: Number of Completed Packets (0x13) plen 5
>
> #18 [hci0] 6.936043
Num handles: 1
Handle: 256
Count: 1
> SCO Data RX: Handle 0 flags 0x00 dlen 48
>
> #19 [hci0] 6.939958
> SCO Data RX: Handle 257 flags 0x00 dlen 48
>
> #20 [hci0] 6.939968
> SCO Data RX: Handle 257 flags 0x00 dlen 48
>
> #21 [hci0] 6.939969
> SCO Data RX: Handle 257 flags 0x00 dlen 48
>
> #22 [hci0] 6.939971
< SCO Data TX: Handle 257 flags 0x00 dlen 48
#23 [hci0] 6.940293
< SCO Data TX: Handle 257 flags 0x00 dlen 48
#24 [hci0] 6.940372
< SCO Data TX: Handle 257 flags 0x00 dlen 48
#25 [hci0] 6.940428
.....
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https://bugs.launchpad.net/bugs/1878194
Title:
[Sennheiser HD 4.50 BTNC] Bluetooth headset not working when selecting
HSP/HFP audio profile in Focal Fossa
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