Comment # 20 on bug 1182552 from Kim Frederiksen

(In reply to Takashi Iwai from comment #19)
> Then let's try to gather the debug messages from usb-audio driver.  It can
> be enabled as in comment 10, but maybe a safer way would be to boot with
>   snd_usb_audio.dyndbg=+p
> boot option.  Then the debug prints are enabled from the beginning.
> 
> At first, get the dmesg output from the bad kernel (with the option above)
> while Teams is working fine.  Then, later on, when Teams gets broken, get
> the dmesg output again, and we can compare the logs.
> 
> At the same time, please try to get the contents of
> /proc/asound/card1/pcm0c/sub0/* files in both situations.  (The card1 should
> correspond to Plantoronics headset, check the contents of /proc/asound/cards
> beforehand.)

As my headset was already not working, I used the "echo -n "module
snd_usb_audio +p" > /sys/kernel/debug/dynamic_debug/control" to enable debug.

I then did a MS Teams test call and the microphone was not working. See
attached file "not-working-comment20.txt"

I then re-plugged the headset and tried the MS Teams again - still not working. 

I then started the MS Teams test call - while active, I re-plugged the headset
and microphone was working. Please see attach file "working-comment20.txt".