*** This bug is a duplicate of bug 1871794 ***
https://bugs.launchpad.net/bugs/1871794
And I just did a test on that Lenovo laptop. Disable the on-board
bluetooth host controller via BIOS, and plug in a usb bluetooth dongle
(CSR8510 A10 0a12:0001), now the hci0 is the external usb bt dongle. And
all 4 headsets could work well in hsp/hfp mode now, both playback and
recording work well. And through hciconfig, I could see the sco packets
number is not zero anymore.
So for my case, it is kernel driver or firmware issue instead of
pulseaudio issue.
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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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