On So, 2009-01-04 at 21:08 +0000, Dominique Michel wrote:
> Le Sun, 4 Jan 2009 21:00:35 +0000,
> Dominique Michel <dominique.mic...@vtxnet.ch> a écrit :
>
> > Le Sun, 04 Jan 2009 19:50:06 +0100,
> > Tobias Gödderz <goedd...@uni-bonn.de> a écrit :
> >
> > > On So, 2009-01-04 at 12:15 +0000, Dominique Michel wrote:
> > > > Le Sun, 04 Jan 2009 12:02:44 +0100,
> > > > Tobias Gödderz <goedd...@uni-bonn.de> a écrit :
> > >
> > > > > I have a laptop and use an Aureon 5.1 USB card from Terratec at home,
> > > > > and my internal sound card if I'm on the road. I am, of course, too
> > > > > lazy
> > > > > to switch the default soundcard manually, so I wonder if there is a
> > > > > way
> > > > > to either
> > > > >
> > > > > i) make the USB soundcard the default, and automatically use the
> > > > > other
> > > > > if the USB card isn't available
> > > > > or
> > > > > ii) use a multi device to dupe the audio stream to both cards that
> > > > > doesn't fail if one card isn't available, but silently ignores
> > > > > that
> > > > > and just plays on the other one.
> > > > >
> > > > > Of course I could write a script that changes my ~/.asoundrc if the
> > > > > USB
> > > > > card is available or not, if there is no sane way to do it with alsa.
> > > > >
> > > >
> > > > It must be also possible to use udev. I am no an expert, but I know
> > > > that,
> > > > if udev load your usb sound card before alsasound, no matter what is
> > > > in /etc/modprobe.conf, the usb sound card will be the first one, that
> > > > imply the default card.
> > > >
> > > > Most users do not want that and blacklist usb_snd_audio
> > > > in /etc/modprobe,d/blacklist.
> > >
> > > Hm. I tried using the index=n option, and it works in the way that the
> > > order is preserved, but if card 0 isn't plugged in, even at boot time,
> > > alsa still tries to use it, which results in:
> >
> > The index option don't work if udev load the usb card before alsasound. In
> > such a case, usb_snd_audio will be the first sound card because it will be
> > loaded before that alsasound the sound modules for the other cards.
> before that alsasound load the sound modules for the other cards.
>
> >
> > In your case, I think that alsasound get confused. It would be better to
> > load
> > the usb sound card as last card. That way, alsasound will work, it will
> > just issue an error message about the usb sound card but will load the
> > modules
> > for the other cards.
> >
> > After, I don't know if it is possible to make a .asoundrc file that will
> > work
> > with and without the usb card. Maybe make 2 of them and test for the usb
> > sound
> > card in ~/.profile (if using gdm) in order to symlink the one to use.
> >
> > As example, if /proc/asound/card1 is your usb card:
> >
> > CARD_FOUND=$(ls /proc/asound|grep card1)
> > if [[ "$CARD_FOUND" == "card1" ]]; then
> > ln -s "/home/goedder/.asoundusb" "/home/goedder/.asoundrc"
> > else
> > ln -s "/home/goedder/.asoundnousb" "/home/goedder/.asoundrc"
> > fi
> Sorry! That will work:
>
> CARD_FOUND=$(ls /proc/asound|grep card1)
> if [[ "$CARD_FOUND" == "card1" ]]; then
> rm "/home/goedder/.asoundrc"
> ln -s "/home/goedder/.asoundusb" "/home/goedder/.asoundrc"
> else
> rm "/home/goedder/.asoundrc"
> ln -s "/home/goedder/.asoundnousb" "/home/goedder/.asoundrc"
> fi
Thank you.
Kind regards,
Tobias
--
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