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Date: Mon, 25 Feb 2008 00:06:17 -0500
From: "Ritesh Kumar" <ritesh@cs.unc.edu>
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Subject: Re: [gentoo-user] Switch between sound cards?
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On Sun, Feb 24, 2008 at 3:45 PM, Grant <emailgrant@gmail.com> wrote:
> > > > > 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
> > >
> >
> > You might want to take a look at the new pulseaudio daemon. I don't use
> > it but as far as I know it's perfect for complex setups like yours.
> > Think of it as a (transparent, if necessary) layer between your
> software
> > and alsa. It should be easier to reconfigure than alsa.
> >
> > You could use it (or the older the older jack daemon) to send audio to
> > both devices.
>
> Alright, but it seems like ALSA has some native support for multiple
> cards. Does anyone have more than one sound card and the ability to
> switch between them in native ALSA?
>
>
I did a lot of search sometime back to get this solved... my blog entry on
this is at the following link.
http://defectivecompass.wordpress.com/2007/12/05/alsa-configuration/
I would also recommend you to take a look a pulseaudio (I have an entry for
that on my blog as well). Hot switching of audio streams between devices is
really cool!
_r
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On Sun, Feb 24, 2008 at 3:45 PM, Grant <<a href="mailto:emailgrant@gmail.com">emailgrant@gmail.com</a>> wrote:<br><div class="gmail_quote"><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div><div></div><div class="Wj3C7c">> > > > I have a USB sound card and an internal sound card in my laptop. Is<br>
> > > > there a way to switch between them while the system is booted? Is<br>
> > > > module loading/unloading via modprobe the best way to do it?<br>
> > > ><br>
> > > > - Grant<br>
> > > > --<br>
> > > > <a href="mailto:gentoo-user@lists.gentoo.org">gentoo-user@lists.gentoo.org</a> mailing list<br>
> > > ><br>
> > > ><br>
> > ><br>
> > > Why switch between them when you can use them both at the same time as<br>
> > > hw:0 and hw:1?<br>
> ><br>
> > Thanks Mark. After studying your config, here is mine:<br>
> ><br>
> > alias snd-card-0 snd-hda-intel<br>
> > options snd-hda-intel index=1<br>
> > options snd-hda-intel model=acer<br>
> ><br>
> > alias snd-card-1 snd-usb-audio<br>
> > options snd-usb-audio index=0<br>
> ><br>
> > alias sound-slot-0 snd-card-0<br>
> > alias sound-slot-1 snd-card-1<br>
> ><br>
> > alias /dev/mixer snd-mixer-oss<br>
> > alias /dev/dsp snd-pcm-oss<br>
> > alias /dev/midi snd-seq-oss<br>
> ><br>
> > options snd cards_limit=2<br>
> ><br>
> > I get sound from the USB card but not from the internal card<br>
> > (snd-hda-intel). How can I tell the system to turn off the USB card<br>
> > and turn on the internal card?<br>
> ><br>
> > - Grant<br>
> ><br>
><br>
> You might want to take a look at the new pulseaudio daemon. I don't use<br>
> it but as far as I know it's perfect for complex setups like yours.<br>
> Think of it as a (transparent, if necessary) layer between your software<br>
> and alsa. It should be easier to reconfigure than alsa.<br>
><br>
> You could use it (or the older the older jack daemon) to send audio to<br>
> both devices.<br>
<br>
</div></div>Alright, but it seems like ALSA has some native support for multiple<br>
cards. Does anyone have more than one sound card and the ability to<br>
switch between them in native ALSA?<br>
<div><div></div><div class="Wj3C7c"><br></div></div></blockquote></div><br>I did a lot of search sometime back to get this solved... my blog entry on this is at the following link.<br><a href="http://defectivecompass.wordpress.com/2007/12/05/alsa-configuration/">http://defectivecompass.wordpress.com/2007/12/05/alsa-configuration/</a><br>
<br>I would also recommend you to take a look a pulseaudio (I have an entry for that on my blog as well). Hot switching of audio streams between devices is really cool!<br><br>_r<br><br>
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