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Date: Sun, 24 Feb 2008 15:21:52 -0800
From: Grant <emailgrant@gmail.com>
To: gentoo-user@lists.gentoo.org
Subject: Re: [gentoo-user] Switch between sound cards?
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> Grant,
> If you want to do a complete switch then you would change your USB
> card to index 0 and restart Als which would make the USB card the
> default since card 0 is always the default for Alsa. On the other
> hand, if you wanted to just leave the onboard card as default and send
> audio from a specific application to the USB card you would tell the
> application to use hw:1 explicity, either in the command line when you
> start the app or in an application's config file. On my system I let
> all my web/browest audio go to the onboard sound card but I send all
> my CD audio directly to my good card using Aqualung and configuring it
> from the command line. (Actually in my launcher.)
>
> to the best of my knowledge there has never been a way to simply
> switch sound cards on the fly in Alsa. I've requested this sometime
> back but the developers haven't shown any interest.
>
> Hope this helps,
> Mark
Hi Mark,
Changing the index and restarting alsasound would be a great switching
method but I can't get that to work. No matter which one I set to
index=0 and which to index=1 the sound always comes out of the USB
card.
BTW, what sound card are you using? Here's mine, it's great:
http://diyparadise.com/shop/index.php?main_page=product_info&cPath=2&products_id=82
- Grant
> > > > I have a USB sound card and an internal sound card in my laptop. Is
> > > > there a way to switch between them while the system is booted? Is
> > > > module loading/unloading via modprobe the best way to do it?
> > > >
> > > > - Grant
> > > > --
> > > > gentoo-user@lists.gentoo.org mailing list
> > > >
> > > >
> > >
> > > Why switch between them when you can use them both at the same time as
> > > hw:0 and hw:1?
> >
> > Thanks Mark. After studying your config, here is mine:
> >
> > alias snd-card-0 snd-hda-intel
> > options snd-hda-intel index=1
> > options snd-hda-intel model=acer
> >
> > alias snd-card-1 snd-usb-audio
> > options snd-usb-audio index=0
> >
> >
> > alias sound-slot-0 snd-card-0
> > alias sound-slot-1 snd-card-1
> >
> >
> > alias /dev/mixer snd-mixer-oss
> > alias /dev/dsp snd-pcm-oss
> > alias /dev/midi snd-seq-oss
> >
> >
> > options snd cards_limit=2
> >
> > I get sound from the USB card but not from the internal card
> > (snd-hda-intel). How can I tell the system to turn off the USB card
> > and turn on the internal card?
> >
> > - Grant
> >
> >
> >
> >
> > > # Alsa 0.9.X kernel modules' configuration file.
> > > # $Header: /var/cvsroot/gentoo-x86/media-sound/alsa-utils/files/alsa-modules.conf-rc,v
> > > 1.4 2004/11/16 01:31:22 eradicator Exp $
> > >
> > > # ALSA portion
> > > alias char-major-116 snd
> > >
> > > # OSS/Free portion
> > > alias char-major-14 soundcore
> > >
> > > ## ALSA portion
> > > alias snd-card-0 snd-intel8x0
> > > options snd-intel8x0 index=0
> > > alias snd-card-1 snd-hdsp
> > > options snd-hdsp index=1
> > >
> > > ## OSS/Free portion
> > > alias sound-slot-0 snd-card-0
> > >
> > >
> > > # OSS/Free portion - card #1
> > > alias sound-service-0-0 snd-mixer-oss
> > > alias sound-service-0-1 snd-seq-oss
> > > alias sound-service-0-3 snd-pcm-oss
> > > alias sound-service-0-8 snd-seq-oss
> > > alias sound-service-0-12 snd-pcm-oss
> > >
> > > alias /dev/mixer snd-mixer-oss
> > > alias /dev/dsp snd-pcm-oss
> > > alias /dev/midi snd-seq-oss
> > >
> > > # Set this to the correct number of cards.
> > > options snd cards_limit=2
--
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