Comment 56 for bug 1871794

@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