We received a new headset "Microsoft Modern Wireless Headset", and this doesn't
seem working properly in a few ways on Linux desktops.

The device provides two interfaces: USB-audio (with a dongle) and
Bluetooth-audio, and the interface can be chosen by a switch on the headset. 
The connections of both interfaces work out-of-the-box.

The USB audio has the following issues:

- The playback volume (appearing as "PCM") shows the incorrect dB range
information, which confuses pipewire / PulseAudio.

- The capture volume and switch have no effect.  But the presence confuses
PA/PW as if the hardware supports the volume/switch control.

- There are occasional (self-)disconnections when the application doesn't use
the device.

- The volume up/down via dial on the the right ear pad doesn't work properly;
it jumps up/down.

The BT connection shows fewer problem, as it seems.