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    Problems with the interaction between PulseAudio and JACK

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    Background Info

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    - Like many distributions, Ubuntu has decided to use PulseAudio as - the default audio system. PulseAudio is a rich and capable system that - provides excellent services for typical users of Linux on the desktop. - However, it is not capable of the type of performance that tools like Ardour - require and in particular does not offer the possibility of sending audio - between applications that can make the Linux audio environment a very - interesting one. -

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    - This would not be a problem if it were not for the fact that JACK will not - run correctly (if at all) if it needs to use the same soundcard/audio - interface that PulseAudio is using. And since, PulseAudio on Ubuntu is - configured by default to always use the (typically single) audio interface on - the computer, this is a bit of a problem. -

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    - The developers of JACK and PulseAudio got together in 2009 and agreed upon a - mechanism by which PulseAudio and JACK could cooperate in their use of a - single soundcard. Whether or not PulseAudio is running by default, when JACK - starts up it sends out a request to use the soundcard. If PulseAudio is - running, it will give up its use of the soundcard to allow JACK to take over - (and can optionally be told to route its own audio through JACK). When JACK - finishes, it sends out another message, and PulseAudio can once again use the - soundcard directly. -

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    What is the problem?

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    - The specific issues known at this time for all flavors of Ubuntu 12.04 and - 12.10 are: -

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    Symptoms

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    - A message like Cannot start JACK in the output from JACK as it - starts up (though see the next section for other causes of this). This output - may be hidden in the Messages window of QJackCtl (aka JACK Control), so one - should check there. -

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    How to fix

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    - These bugs do not affect releases from 13.04, and earlier releases (12.04 and - 12.10) are in the process of being fixed. -

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    Problems with JACK configuration

    What is the problem?