[LAU] jackd and alsa devices

"Victor A. Stoichiță" vicsto at gmail.com
Tue Jun 26 15:41:50 UTC 2012

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 at gmail.com <mailto:jari.ak.suominen at gmail.com>> wrote:
>     http://jackaudio.org/device_naming
>     2012/6/26 Danni Coy <danni.coy at gmail.com
>     <mailto:danni.coy at gmail.com>>:
>     > 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.
>     >
>     >
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>     >
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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 
(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,
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