[pulseaudio-discuss] Bluetooth devices no longer detected after upgrade from 2.0 to 4.0

[Georg Chini]

Hi Mikel,

one addition:
>> Hi Mikel,
>>
>> after a bit of testing, I found an easy way to reproduce the problem.
>> It seems to occur when the phone is in "connected" state and you try
>> to move the source away from the loopback module. Pacmd shows the
>> bluetooth source as "SUSPENDED" while the source-output is "RUNNING".
> This looks perfectly fine to me. The Bluetooth source is no longer in
> use (you moved away the source-output) and therefore SUSPENDED, as
> opposed to the source-output which is pulling audio from the alsa card
> (your sound card, I guess).

No, before I move, while the BT source is still connected to the
source-output, the source is suspended while the source-output
is running. After the move everything looks like one would expect,
the BT source is still suspended while the new source and the
source-output are running.

>
> You should check whether your alsa source is RUNNING. If not, you
> might have hit an issue. I however think this is completely unrelated
> to the Bluetooth modules.
>
>> Doing the following triggers the problem:
>>
>> 1) insert a loopback module with source=your_phone
>> 2) wait until the phone is no longer playing
>> 3) with pavucontrol move the source of the loopback module to another device
>>
>> What is strange is that the messages start after the source has already
>> changed.
>> I inserted a few log statements in module-loopback.c and got:
>>
>> [bluetooth] module-loopback.c: Source Output detach
>> bluez_source.00_12_D1_8C_FC_80
>> [pulseaudio] module-loopback.c: Source Output moving to
>> alsa_input.pci-0000_00_1b.0.analog-stereo
>> [alsa-source-VT1828S Analog] module-loopback.c: Source Output attach
>> alsa_input.pci-0000_00_1b.0.analog-stereo
>> [alsa-sink-USB Audio] module-loopback.c: Requesting rewind due to end of
>> underrun.
>> [alsa-sink-USB Audio] module-loopback.c: Requesting rewind due to end of
>> underrun.
>> ...
> Have you tried loading module-loopback (regardless of BT devices) with
> the same sink and source (as resulted from your sequence above, i.e.
> probably from alsa to alsa) and see if the issue with the rewinds
> reproduces?
>
> Cheers,
> Mikel
Regards
              Georg