[PlanetCCRMA] jackd and two Delta1010 cards

[Fernando Lopez-Lezcano]

On Mon, 2006-07-03 at 18:17 +0000, Bob Wilkinson wrote:
> Hopefully someone can help me on this.  I have installed Planet CCRMA 
> from an FC4 installation.  I am using two Delta1010 sound devices, and 
> am trying to get them to act as one big device.
> 
> I have searched the web, and found an .asoundrc file (I actually wrote 
> it to /etc/asound.conf) to create the "virtual" card (binding the two 
> cards together).  My asound.conf file looks like this:
> 
> pcm.multi_capture {
>         type multi
>         slaves.a.pcm hw:0
>         slaves.a.channels 12
>         slaves.b.pcm hw:1
>         slaves.b.channels 12
[MUNCH]
> 
> However, when I attempt to run JACK from a command line,
> 
> jackd -d alsa -C multi_capture -P multi_playback
> 
>  I get the error:
> 
> ALSA: mmap-based access is not possible for the capture stream of this audio interface
> ALSA: cannot configure capture channel
> 
> I have tried just starting jack for multi_playback only - same error, just replaced 
> with "playback".
> 
> Unfortunately, I'm a complete newbie, and now have less than a week before 
> my company expects this thing to be up and running flawlessly.
> 
> Can anybody help?  What am I missing?

Which kernel/alsa are you running? Run:
  uname -r
to see which kernel you are booting. There should be a matching
kernel-module-alsa package for it ("rpm -q -a|grep kernel-module-alsa")

I seem to remember that alsa had problems with this type of stuff. I
also seem to remember a post about this being solved but I don't
remember on which version. 

-- Fernando