Jan 'RedBully' Seiffert wrote: > After Gentoo switched to udev-coldplug, my two soundcards get randomly > reordered on reboot. Now I need to write a udev rule to give them a > persistent ordering, but failed to do so until now, partly because i > don't know on what key ALSA orders devices so they become card0 and 1, > hw0 and hw1, partly because this feature of udev is so new. ALSA's card ordering mechanism predates udev and isn't compatible with it. The ALSA framework has its own internal card list (that is shown in /proc/asound/cards). Drivers can be instructed to take a specific card number with the 'index' option, and this is the only official way of reordering cards. It is, in theory, possible to rename the device files, but you have to be aware that 1) all devices files of one card must be renamed consistently, i.e, the card number in the controlC*/hwdepC*D*/rawmidiC*D*/pcmC*D*p/ pcmC*D*c files (the number after the "C") must be the same for all device files belonging to each card; and 2) enumerating cards will no longer work correctly (the card number returned by ALSA will still be the number specified with the index parameter), i.e., card names/descriptions will be wrong when a program tries to show them. Regards, Clemens ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-devel
