I have a CEL-TEC F5A headset. The spec says:
Bluetooth 4.0, profiles: Headset, Hands free, A2DP, AVRCP/HSP/HFP
It plays nicely with High Fidelity Playback (A2DP sink) profile.
When I want to switch audio input to the headset's microphone, the output profile automatically changes to Headset Head Unit (HFS/HFP) and the quality is terrible - like 8bit sound or something. When I switch it back to A2DP, the input is back to desktop mic.
I've read few of other questions and seems A2DP is expected not to support input, right? But the HFP part in HFS/HFP is High Fidelity Playback I guess? That sounds like it could work as a headset and still not sound like 1950's phone.
How could I simplify switching between the profiles so that it is HFS/HFP when I talk and A2DP when I listen? E.g. as a push-to-talk.
Ubuntu 17.10, no sound customization IIRC, everything latest.
$ pactl list cards Card #0 Name: alsa_card.pci-0000_00_03.0 ... Card #4 Name: bluez_card.00_19_5D_25_6F_6C Driver: module-bluez5-device.c Owner Module: 30 Properties: device.description = "F5A" device.string = "00:19:5D:25:6F:6C" device.api = "bluez" device.class = "sound" device.bus = "bluetooth" device.form_factor = "headset" bluez.path = "/org/bluez/hci0/dev_00_19_5D_25_6F_6C" bluez.class = "0x240404" bluez.alias = "F5A" device.icon_name = "audio-headset-bluetooth" device.intended_roles = "phone" Profiles: a2dp_sink: High Fidelity Playback (A2DP Sink) (sinks: 1, sources: 0, priority: 10, available: yes) headset_head_unit: Headset Head Unit (HSP/HFP) (sinks: 1, sources: 1, priority: 20, available: yes) off: Off (sinks: 0, sources: 0, priority: 0, available: yes) Active Profile: a2dp_sink Ports: headset-output: Headset (priority: 0, latency offset: 0 usec, available) Part of profile(s): a2dp_sink, headset_head_unit headset-input: Headset (priority: 0, latency offset: 0 usec) Part of profile(s): headset_head_unit
The problem here is not that the microphone does not work, but rather that the audio quality worsens when it is activated.