On Tue, 20 Jan 2009, Lennart Poettering wrote:

Heya!

Hmm, it would be nifty if we could get the alsa card name (i.e. the one shown in [] in /proc/pcm/cards) as an attribute file in /sys/class/sound/cardX/name. Even more useful would be if this property would be writable so that the cards may be renamed during runtime.

This could be very useful to establish stable card names via udev rules, similar to what is already done to network interface names ("eth0", ...).

Would such a change be acceptable?

It's already implemented in our recent repositories (the change will be in 2.6.29):

Author: Jaroslav Kysela perex@perex.cz Date: Tue Nov 11 16:51:02 2008 +0100

ALSA: add /sys/class/sound/card#/id (r/w) and card#/number (r/o) files

For udev, we need a way to rename soundcard names. The soundcard numbers (indexes) are hardwired but we have a text identification which can be changed at run-time. The ALSA user space tools already allow using of this text identification.

Signed-off-by: Jaroslav Kysela perex@perex.cz Signed-off-by: Takashi Iwai tiwai@suse.de

----- Jaroslav Kysela perex@perex.cz Linux Kernel Sound Maintainer ALSA Project, Red Hat, Inc.