On Sun Mar 09, 2008 at 07:24:00PM -0700, Mark Knecht wrote: > On Sun, Mar 9, 2008 at 7:00 PM, David <dplist@xxxxxxx> wrote: > > On Sun, 9 Mar 2008 15:57:16 -0700 > > "Mark Knecht" <markknecht@xxxxxxxxx> wrote: > > > > > On Sun, Mar 9, 2008 at 3:52 PM, drew Roberts <zotz@xxxxxxxxxxx> wrote: > > > > > > > > On Sunday 09 March 2008 18:44:21 Mark Knecht wrote: > > > > > Hi, > > > > > I'm aware of and use standard Alsa methods to keep different > > > > > sound cards in the same system straight as far as Alsa is > > > > > concerned. I'm wondering what the proper process would be to > > > > > keep 3 HDSP9652's which are physically in the same system, or > > > > > multiple USB sound devices external to the system, straight as > > > > > far as Alsa is concerned. I'd like to know that a certain card > > > > > always will be always be card 0, card 1 or card 2. I do not want > > > > > Alsa or Linux to make this decision for me and I certainly don't > > > > > want Alsa to change them from boot cycle to boot cycle. > > > > > > > > > > What's the process to determine which identical card is > > > > > which? Do you need to determine some sort of card specific > > > > > hardware ID and then write udev rules or is there some way to do > > > > > this within Alsa? > > > > > > > > I needed to solve this problem a while back. The best help I got > > > > was telling me it was not possible. > > > > > > Humm, that's a pretty glaring disappointment, assuming it's true, and > > > I have no reason to believe it isn't. > > > > > > > > I would be very interested to learn that there is a way. I got a > > > > lot of info that would help with non-identical cards though. > > > > I have not tried this but maybe well crafted udev rules could help ? > > The page http://reactivated.net/writing_udev_rules.html#sysfsmatch > > gives hints about matching device names to data read from sysfs. > > > > Reading this doc, it looks like you might find info that uniquely > > identify each of your cards using the command > > "udevinfo -a -p $(udevinfo -q path -n /dev/snd/<yourdevice>)" and craft > > you local rules from there. > > > > This might be a question worth asking on alsa-users too. > > > > HTH > > > > -- > > David > > > > Yeah, as I said in the original post I suspected that if Alsa couldn't > do it then udev might be the way to go. Unfortunately that might mean > that every time I set up a new system I'd have to craft a file > specifically for that system. I was hoping that maybe there was some > way for Alsa to look at the card's ID and then automatically assign > the cards in ID order, etc. there is, alias snd-slot and snd-card stuff in modprobe conf in /etc (/etc/modules.d/alsa here). im not sure if it works if all the cards are using the same driver keeps my internal on hw:1 so an Indigo is alwyas default anwyays.. _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/mailman/listinfo/linux-audio-user
