On Thu, 23.04.09 20:22, Fernando Lopez-Lezcano (nando@xxxxxxxxxxxxxxxxxx) wrote: > And Fedora, as of recent (f10?, or was that f9?), makes even _that_ > difficult. The _order_ of the sound cards after a reboot is > unpredictable and is not repeatable. > > So the usual way of dealing with the "pro" card within jack does not > work (ie: on one boot hw:0 could be pointing to the motherboard card, on > the next boot it could be pointing to the "pro" card). > > The only fix AFAIK is to add a modprobe.conf that defines the order of > the cards. Easy, right? (in ancient, less civilized times, the order > would always be the same, and if you did not like it there would be an > small app that would let you configure it - that's progress :-) system-config-soundcard used to write 'stable' card index into a modprobe fragment. Doing that often broke hotplug however: if you plug in a card for which no such modprobe.conf fragment exists it will take up the first available index. If you then plug in a card for which such an index has been configured it might find the index taken and hence fails to initialize. We got gazillions of bug reports about situations like this. s-c-s has been deprecated due to that. You don't need stable card indexes. Use the card names instead. Just have a look in /proc/asound/cards and use the names in the []. I.e. "front:Intel" instead of "front:0". Or "hw:AudioPCI" instead of "hw:1" and so on. Relying on card indexes is simply broken. The same as it would be to handle network interfaces with ifindexes. It's time people forget about them. The card names are based on the card model mostly. For most people that should be stable enough. Only very few folks have more than once card of the same model plugged in. There has been some talk at making those completely as well, similar to how network interface names are stable. You can rename cards during runtime by writing to a sysfs file. Unfortunately sound cards usually bear no unique identifier like the MAC address for network cards and hence doing this is not as straightforward as it seems. Nonetheless we really should do this eventually. Would be great if someone could take this up and prepare patches for udev. Better still then using the card name is using the hal path or some udev path/identifier for identifying cards. PA does that. Lennart -- Lennart Poettering Red Hat, Inc. lennart [at] poettering [dot] net ICQ# 11060553 http://0pointer.net/lennart/ GnuPG 0x1A015CC4 -- fedora-devel-list mailing list fedora-devel-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/fedora-devel-list
