Re: [LAU] jackd and alsa devices

On 26/06/2012 16:25, Danni Coy wrote:
> Thanks looks like I need to look at what it would take to have the gui
> front end (Cadence) behave this way by default
>
>
> On Tue, Jun 26, 2012 at 10:31 PM, Jari Suominen
> <jari.ak.suominen@email-addr-hidden <mailto:jari.ak.suominen@email-addr-hidden>> wrote:
>
> http://jackaudio.org/device_naming
>
> 2012/6/26 Danni Coy <danni.coy@email-addr-hidden
> <mailto:danni.coy@email-addr-hidden>>:
> > I have only been using jackd with the alsa back end for a short
> amount of
> > time (been a ffado user for many years). I am also dealing with
> a friends
> > cheap laptop which is having issues; basically the order of the
> alsa devices
> > is changing with every boot which means I have to configure jack
> every time
> > I want to use it.
> >
> > Is there any way to get jack to remember the description of the
> device
> > rather than the number and search for that description on
> startup (then use
> > the device number if that fails). This would seem to me like a
> much saner
> > way of doing things to me.
> >
> >
> > _______________________________________________
> > Linux-audio-user mailing list
> > Linux-audio-user@email-addr-hidden
> <mailto:Linux-audio-user@email-addr-hidden>
> > http://lists.linuxaudio.org/listinfo/linux-audio-user
> >
>
>
>
>
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Hi Danni,

Another approach is to force the ALSA (or actually the kernel) to assign
persistent indexes to your cards. This is done through modprobe options.
See the post here
<http://artisan.karma-lab.net/predeterminer-indexes-peripheriques-alsa>
(in French).
Basically, you edit (and/or create) /etc/modprobe.d/alsa-base.conf to
look like this:

    options snd-usb-audio index=0 # this ensures that your usb card
    comes in first
    options snd-hda-intel index=1 # if you have an intel card...

You can list all the modules which are used by sound devices on your
computer by running " sudo lsmod | grep snd" this into a terminal. You
can set the index number for all of them, and then Jack should find them
always in the same place. This works even for software were you only
have a dropdown list with card index numbers (where method in
http://jackaudio.org/device_naming does not work).

If you have several usb cards, they will all use snd-usb-audio, but you
can still preset their indexes by specifying vendor/product numbers...
This is explained in detail in the post mentioned above. Please tell me
if you need an English translation.

After editing /etc/modprobe.d/alsa-base.conf, make sure you either rmmod
then modprobe the corresponding modules, or reboot.

Good luck,
Victor

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Received on Tue Jun 26 20:15:02 2012