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)
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https://bugs.launchpad.net/bugs/1871794
Title:
[Bluetooth] No audio output/input in HSP/HFP mode
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