Le Sun, 4 Jan 2009 21:00:35 +0000,Dominique Michel <dominique.michel@xxxxxxxxx> a écrit : > Le Sun, 04 Jan 2009 19:50:06 +0100,> Tobias Gödderz <goedderz@xxxxxxxxxxx> 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 <goedderz@xxxxxxxxxxx> 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"> fiSorry! 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 > > I never tested such a thing, but maybe that it can work.> > Dominique> > ------------------------------------------------------------------------------> _______________________________________________> Alsa-user mailing list> Alsa-user@xxxxxxxxxxxxxxxxxxxxx> https://lists.sourceforge.net/lists/listinfo/alsa-user ------------------------------------------------------------------------------_______________________________________________Alsa-user mailing listAlsa-user@xxxxxxxxxxxxxxxxxxxxxxxxxx://lists.sourceforge.net/lists/listinfo/alsa-user
