[LAU] jackd and alsa devices

["Victor A. Stoichiță"]

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 
<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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