@Marco
On my machine with BT moudle 8087:0026, I reproduced the problem, and
replaced with 20.10 firmware ibt-19-0-4.sfi, but still could not work in
hsp/hfp mode.
What I found is the bt driver can't receive the SCO packet, the returned
packet length is always 0.
And if the bt headset can't work in the hsp/hfp mode, please run hci config, if
the output like below (RX bytes: sco:0 TX bytes: sco:1), that means the bt
driver can't receive SCO packets, as a result the headset can't work in hsp/hfp
mode since hsp/hfp mode depends on SCO link.
hci0: Type: Primary Bus: USB
BD Address: D4:D2:52:3D:49:E6 ACL MTU: 1021:4 SCO MTU: 96:6
UP RUNNING PSCAN
RX bytes:23638 acl:85 sco:0 events:3463 errors:0
TX bytes:980646 acl:323 sco:1 commands:3121 errors:0
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https://bugs.launchpad.net/bugs/1871794
Title:
[Bluetooth] No audio output/input in HSP/HFP mode
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