On Tue, 11 Nov 2008, Jelle de Jong wrote: > Jaroslav Kysela wrote: > > On Tue, 11 Nov 2008, Takashi Iwai wrote: > > > >>> Almost all devices can be managed with udev rules, that is where the > >>> system is designed for, there are also alsa rules in there, if they > >>> don't work what is wrong then? is it an alsa issue, or udev, what are > >>> the dependencies when alsa uses hardware. How are the /dev/snd/* devices > >>> used and what is the /proc/asound/* for ? > >> The card index mechanism in ALSA was introduced much before udev > >> was born. It's just a legacy mechanism, but it's hard to kill without > >> breaking the running system, unfortunately. > > > > Note that you can identify your card via the text identification (check > > /proc/asound/cards to get it in []). You can set this identification in > > the module insert time and use for example 'hw:Intel' in your apps without > > bothering with indexes. > > > > The missing part is the modification of this text identification using > > sysfs at runtime for udev. Some time ago, I was trying to add this setup > > to /sys/class/sound, but the sysfs core code was not prepared for this > > change. I'll try to check the situation again. > > > > As response to: > http://mailman.alsa-project.org/pipermail/alsa-devel/2008-November/012366.html > > I am not sure if it is good practice to repose to an RFC if so please > tell me then we will continue the discussion in the RFC thread. > > Thank you Jaroslav for creating the patch this is really appreciated, if > all things work I will send you some dutch stroopwafels :-D > > I am just curious how you patch can be used with udev? What did you have > in mind? > > Would something like this be possible: > > SUBSYSTEM=="sound", ACTION="add" KERNELS=="3-1", > NAME="snd/by-id/audiodevice0" > SUBSYSTEM=="sound", ACTION="add" KERNELS=="3-2", > NAME="snd/by-id/audiodevice1" No, something like this: SUBSYSTEM=="sound", ACTION=="add", KERNEL=="controlC*", KERNELS=="3-2", \ ATTR{device/id}="audiodevice1" > pcm.!default { > type plug > slave.pcm dmixer > } > pcm.dmixer { > type dmix > ipc_key 1024 > slave.pcm hw:audiodevice0 > } This looks OK. Jaroslav ----- Jaroslav Kysela <perex@xxxxxxxx> Linux Kernel Sound Maintainer ALSA Project, Red Hat, Inc. _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
