Same issue here (without headset line). Cannot switch to HSP/HFP mode. I have a dual boot Windows 10, the headset (audio output and microphone) works fine there.
Ubuntu 18.04.4, kernel 4.15.0-106-generic, pulseaudio 11.1
Card: HDA Intel PCH HD (Dell 200 Series PCH HD) Chip: Realtek ALC3861
Device 98:52:3D:73:D3:5B (public)
Name: Soundcore Liberty Air 2
Alias: Soundcore Liberty Air 2
Class: 0x00240404
Icon: audio-card
Paired: yes
Trusted: yes
Blocked: no
Connected: yes
LegacyPairing: no
UUID: Serial Port (00001101-0000-1000-8000-00805f9b34fb)
UUID: Audio Source (0000110a-0000-1000-8000-00805f9b34fb)
UUID: Audio Sink (0000110b-0000-1000-8000-00805f9b34fb)
UUID: A/V Remote Control Target (0000110c-0000-1000-8000-00805f9b34fb)
UUID: Advanced Audio Distribu.. (0000110d-0000-1000-8000-00805f9b34fb)
UUID: A/V Remote Control (0000110e-0000-1000-8000-00805f9b34fb)
UUID: Handsfree (0000111e-0000-1000-8000-00805f9b34fb)
UUID: Vendor specific (0000eb03-d102-11e1-9b23-00025b00a5a5)
RSSI: -59
Same issue here (without headset line). Cannot switch to HSP/HFP mode. I have a dual boot Windows 10, the headset (audio output and microphone) works fine there.
Ubuntu 18.04.4, kernel 4.15.0-106-generic, pulseaudio 11.1
Card: HDA Intel PCH HD (Dell 200 Series PCH HD) Chip: Realtek ALC3861
Device 98:52:3D:73:D3:5B (public) 0000-1000- 8000-00805f9b34 fb) 0000-1000- 8000-00805f9b34 fb) 0000-1000- 8000-00805f9b34 fb) 0000-1000- 8000-00805f9b34 fb) 0000-1000- 8000-00805f9b34 fb) 0000-1000- 8000-00805f9b34 fb) 0000-1000- 8000-00805f9b34 fb) d102-11e1- 9b23-00025b00a5 a5)
Name: Soundcore Liberty Air 2
Alias: Soundcore Liberty Air 2
Class: 0x00240404
Icon: audio-card
Paired: yes
Trusted: yes
Blocked: no
Connected: yes
LegacyPairing: no
UUID: Serial Port (00001101-
UUID: Audio Source (0000110a-
UUID: Audio Sink (0000110b-
UUID: A/V Remote Control Target (0000110c-
UUID: Advanced Audio Distribu.. (0000110d-
UUID: A/V Remote Control (0000110e-
UUID: Handsfree (0000111e-
UUID: Vendor specific (0000eb03-
RSSI: -59