mic not working on JBL Quantum series USB headsets

[Jakub Fišer]

Hello Alsa people,

hope this is the right place to post.

My Quantum 800's microphone doesn't work and I found other reports suggesting
this issue affects the whole Quantum product line.

It's a wireless headset with USB dongle.

I *think* the issue is with Alsa because the Capture device is "detected" but not
populated under /sys:

arecord list of devices:
```
% arecord -l
**** List of CAPTURE Hardware Devices ****
(...)
card 1: Q800 [Quantum 800], device 0: USB Audio [USB Audio]
Subdevices: 1/1
Subdevice #0: subdevice #0
```

amixer knobs:
```
% amixer -c1
Simple mixer control 'PCM',0
Capabilities: pswitch pswitch-joined
Playback channels: Mono
Mono: Playback [on]
Simple mixer control 'PCM',1
Capabilities: pswitch pswitch-joined
Playback channels: Mono
Mono: Playback [on]
Simple mixer control 'Headset',0
Capabilities: cvolume cvolume-joined cswitch cswitch-joined
Capture channels: Mono
Limits: Capture 0 - 64
Mono: Capture 64 [100%] [0.00dB] [on]
```

arecord trying to use the capture device:
```
% arecord -Dhw:1,0 /tmp/out.wav
arecord: main:831: audio open error: No such file or directory
```

/sys pcm "endpoints" (missing capture endpoint):
```
% ls -1d /sys/class/sound/pcm*
/sys/class/sound/pcmC1D0p
/sys/class/sound/pcmC1D1p
```

nothing suspicious in dmesg:
```
usb 3-1.3: new full-speed USB device number 12 using xhci_hcd
usb 3-1.3: New USB device found, idVendor=0ecb, idProduct=203e, bcdDevice= 1.00
usb 3-1.3: New USB device strings: Mfr=4, Product=5, SerialNumber=0
usb 3-1.3: Product: Quantum 800
usb 3-1.3: Manufacturer: JBL
usb 3-1.3: Found post-registration device assignment: 0ecb203e:02
input: JBL Quantum 800 Consumer Control as
/devices/pci0000:00/0000:00:1d.4/0000:05:00.0/0000:06:01.0/0000:08:00.0/0000:09:02.0/0000:0a:00.0/us
3/3-1/3-1.3/3-1.3:1.5/0003:0ECB:203E.0024/input/input51
input: JBL Quantum 800 as
/devices/pci0000:00/0000:00:1d.4/0000:05:00.0/0000:06:01.0/0000:08:00.0/0000:09:02.0/0000:0a:00.0/us
3/3-1/3-1.3/3-1.3:1.5/0003:0ECB:203E.0024/input/input52
hid-generic 0003:0ECB:203E.0024: input,hiddev96,hidraw0: USB HID v1.11 Device [JBL Quantum 800] on
usb-0000:0a:00.0-1.3/input5
```

Nothing at all in either Pulse or Pipewire logs.

alsa-info: http://alsa-project.org/db/?f=d9e7a91d97b2f64a0b2d00a05dfc9f9dace3a6f6

Linux 5.12.14-lqx2

Other reports:

https://bbs.archlinux.org/viewtopic.php?pid=1983686
https://gitlab.freedesktop.org/pulseaudio/pulseaudio/-/issues/998

The headset also works for me on Windows 10 out of the box (and according to the Internet, it
works on Mac, too).

Note that I updated the headset and dongle to the latest firmware (v3.1.5.0) with no effect.

The 800 model also has Bluetooth with both A2DP and HSP profile. Not sure if this is relevant
but for clarity:

- with Pulse A2DP profile works only as output device (SBC and AAC), other profiles, such as
HSP, are listed but "unavailable"
- with Pipewire only HSP profiles are listed and available (mSBC, CVSD and "plain"),
microphone *works*

I'd like to help with debugging, just tell me how (or if) I can.

thanks,

-jakub.