Bug#994182: headset functionality broken after recent update

[debian-bugs]

 > Hi,
 >
 > I'm not sure what to do about this issue.

Well, to me it seems pulseaudio 15 should not not be promoted to testing 
until this is sorted out -- given the current boom in video conferencing 
due to working from home, a suddenly broken headset will cause a lot of 
trouble. (Thankfully, I did not have to work this week so I could spend 
three days figuring out what's wrong, couldn't afford this in a work week.)

AFAIU the issue is caused by a change in the btusb kernel driver and 
thus affects most bluetooth devices connected via USB, fixed only in 5.13.
So either the fix needs to be back-ported to the current kernel or 
pulseaudio needs to include the workaround outlined in the linked report.
At the very, very least users should be warned about a potential 
breakage and how to work around that.

>     Positive side effect: ofono seems not to be necessary anymore.
> 
> This is the new feature :)

It's the silver lining in a deluge ... ;)