[TriLUG] ALSA and card ordering

[Andrew Perrin]

Thanks - that worked perfectly.

ap

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Andrew J Perrin - http://www.unc.edu/~aperrin
Assistant Professor of Sociology, U of North Carolina, Chapel Hill
clists at perrin.socsci.unc.edu * andrew_perrin (at) unc.edu


On Thu, 28 Apr 2005 crimsun at fungus.sh.nu wrote:

> On Thu, Apr 28, 2005 at 09:19:42AM -0400, Andrew Perrin wrote:
> > Any ideas on how to tell the system to load the real sound card as card0
> > and snd-bt878 as card 1?
>
> First of all, you need alsa-base (>= 1.0.8-1), because the patches for
> ordering were applied for that revision.
>
> Second, your alsa-driver/kernel needs to be aware of this new ordering.
> So far, the Debian- and Ubuntu-provided kernels have included this
> patch (Sarge/Sid and Hoary+, respectively).
>
> Third, the "proper" (i.e., the way that upstream ALSA has adopted for
> 1.0.9, which Debian has been using since 1.0.8-1) method is to insert
> the appropriate line into /etc/modprobe.d/alsa-base, _not_
> /etc/modprobe.conf, because the presence of the latter will cause all
> scripts in /etc/modprobe.d/ to be skipped, and that is most definitely
> _not_ what you intend.
>
> The negative-mask patch that Thomas coded allows the user to tell ALSA
> to prefer a subset of drivers be loaded as non-primary (e.g., not card
> 0). In your scenario, you'd use:
>
> echo "options snd-bt87x index=-2" | sudo tee -a /etc/modprobe.d/alsa-base
>
> You may then either reboot, or remove the ALSA driver modules for your
> two sound devices manually and reinsert them.
>
> --
> Daniel T. Chen          crimsun at fungus.sh.nu
> GPG key:   www.sh.nu/~crimsun/pubkey.gpg.asc
>