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 On Sun, Feb 24, 2008 at 11:34 AM, Grant <[EMAIL PROTECTED]> 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 > > > > > > # 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 > > [EMAIL PROTECTED] ~ $ > -- > > > gentoo-user@lists.gentoo.org mailing list > > -- gentoo-user@lists.gentoo.org mailing list
