[pulseaudio-discuss] module-switch-on-connect: handling virtual sinks

Михаил Новоселов, Думалогия mikhailnov at dumalogiya.ru
Sat Nov 11 12:03:52 UTC 2017

Yes, of course, it's possible to unload module-switch-on-connect, but that is breaking the existimg user setup.
"a command line switch could be added
to the module so that it ignores virtual sinks" Will be best. Does this flag exist now?

11 ноября 2017 г. 14:26:21 GMT+03:00, Georg Chini <georg at chini.tk> пишет:
>On 11.11.2017 05:28, Михаил Новоселов, Думалогия wrote:
>> Hello,
>> PulseEffects, an application, that can apply different effects or 
>> equalize both input and output sound, cannot work properly when 
>> module-switch-on-connect is on. PulseEffects creates a virtual sinks,
>> but PulseAudio's module-switch-on-connect makes it a default sinks 
>> automatically what severely breaks the logic of PulseEffect's work.
>> Please see https://github.com/wwmm/pulseeffects/issues/99
>> 1) Can we specify that the created sink is a virtual one?
>> 2) Maybe there are other ways to prevent module-switch-on-connect
>> making a newly created virtual device a default one?
>> I wrote the script Dumacast https://github.com/mikhailnov/dumacast 
>> (first of all for my company's (Dumalogiya, http://думалогия.рф) 
>> internal usage), and starting with the newest version of Ubuntu,
>> module-switch-on-connect is on, I ran into the same troubles. My 
>> script 
>> https://github.com/mikhailnov/dumacast/blob/master/usr/bin/dumacast 
>> creates virtual sinks via pactl (lines 135-149), and they are also 
>> made default and break the logic of how the script works. I currently
>> have no idea how to handle it without unloading
>> I tried both Ubuntu's 17.10 default PulseAudio and built from dEbian 
>> sources PulseAudio 11, the situation is the same with them both.
>> What can be done?
>Do you really need module-switch-on-connect? If not, you could just 
>check with
>"pactl list modules short" if the module is loaded and unload it prior 
>to starting
>your application. You can also remove it from default.pa, so that it 
>never gets
>If you need module-switch-on-connect, a command line switch could be
>to the module so that it ignores virtual sinks. The default behavior 
>however can
>not be changed, because other applications might rely on the current
>              Georg

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