Re: /usr/bin/qjackctl and pasuspender on Wheezy

[Kaj Ailomaa <ailomaa@warpmail.net>]

On 05/29/2012 10:26 PM, Kaj Ailomaa wrote:
> On 05/29/2012 08:19 PM, Felipe Sateler wrote:
> > I'm not an expert in JACK, so hopefully someone will correct me if I'm
> > wrong...
> >
> > On Tue, May 29, 2012 at 12:52 PM, Kaj Ailomaa<ailomaa@warpmail.net>
> > wrote:
> > > Not being a scripting wizard, I'm not able to understand how
> > > /usr/bin/qjackctl works.
> > >
> > > Is PA supposed to be suspended at some point?
> >
> > Only if you have jackd2 with dbus support (like the jackd2 package in
> > debian).
> >
> > > I can't figure out if it is because of /usr/bin/qjackctl at any point.
> >
> > AFAIK, no. It is the jack daemon that negotiates the sound card with
> > PA, qjackctl just starts and stops it. This information is all based
> > on last time I tried automatic negotiation, which was a while ago.
> > If PA is already using the sound card (say, your mp3 player is
> > running), the negotiation will fail and PA will not let jackd have
> > control of the sound card. In other words, jack asks "pretty please,
> > can I have the sound card?", and PA decides wether to do it or not.
>
> There is some pasuspender stuff in the /usr/bin/qjackctl starter script.
> In the past, starting qjackctl suspended PA. Now it doesn't. What does
> the pasuspender stuff in the script do for us now?
>
> I talked with someone who had a problem suspending PA by starting
> jackdbus from qjackctl, after having removed pulseaudio-module-jack.
> For me, this is not the case, so perhaps he provided me with wrong
> information. Qjackctl, with or without dbus enabled, will suspend PA
> when I have set jack to use the same output as PA is using.

...provided I have uninstalled pulseaudio-module-jack