[LAU] Kmix + jackd strange behaviour

[drew Roberts]

On Thursday 30 October 2008 05:41:34 Crypto wrote:
> On Thursday 30 October 2008 03:27:40 Patrick Shirkey wrote:
> > Kmix is possibly rewriting the .asoundrc file to make the device the
> > "default" card.
> >
> > I'm not sure what your settings are in qjackctl. Are you assigning
> > devices by name or by node point?
> >
> > ex, intel, usb,  hw:0,0 hw: 1,0
>
> Patrick,
>
> a .asoundrc file is neither in my /home directory nor in the /etc directory
> so I do not think Kmix is creating one.
>
> When I use qjackctl I look at the connections that are possible. qjackctl
> finds all audio devices connected to my notebook and their relevant device
> names and node points and displays them. They are updated whenever I
> restart qjackctl.
>
> It means that I can get a hw:0,0 for my external USB device but I can also
> get a hw:2,0 for it. qjackctl monitors that and always seems to display the
> latest device name/node point combination. So the answer to Your question
> is "I look at the device name and qjackctl knows the node point for jackd
> assigned to the device name".
>
> The problem is that after looking at the combination and chosing the
> relevant device name/node point from this menu list for the external USB
> audio device I am still not getting external audio output with jack when I
> use amarok that I have set to "jack" for audio output. This appears to be
> linked somehow with the Kmix menu display settings. That is, if Kmix
> displays the external USB device settings I am getting amarok external USB
> audio output, but if Kmix displays onboard sound settings then amarok uses
> internal onboard sound, regardless the fact that qjackctl is set to output
> to external USB device.
>
> I wonder if qjacktcl/jackd creates a permanent list of audio devices and
> their node points once and does not update this list afterwards. Whenever a
> device is connected jack looks into this list and takes the node point
> assigned to a device, regardless the fact that the node point could have
> changed meanwhile.

Do you perhaps have two copies of jack running?

grep for jack in a ps output.
>
> Crypto.

all the best,

drew
>
> > > In short form:
> > >
> > > 1.) -> Set Kmix to display onboard sound settings,
> > > -> Set qjackctl to output to external sound card,
> > > -> Set amarok to use jack for audio output,
> > > -> amarok plays via onboard sound.
> > >
> > > 2.) -> Set Kmix to display external USB sound settings,
> > > -> Set qjackctl to output to external USB sound card,
> > > -> Set amarok to use jack for audio output,
> > > -> amarok plays via external USB sound card.
> > >
> > > Could it be a problem with the hotplugging of USB hardware?
> > >
> > > Thanks for any hint,
> > > Crypto.
>
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