Setting up modprobe and kmod support
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The ALSA kernel modules must be loaded every time you boot or reboot
Linux. These modules can be loaded automatically by
the modprobe command which is part of the modutils utilities. The
modprobe command uses a configuration file which tells it which kernel
modules to load and how to load them. This document explains how to set
up the modprobe configuration file.
The name of the modprobe configuration file has unfortunately been
changed several times. For the most recent Linux kernels, Linux 2.6.x,
the file is called modprobe.conf. For old Linux kernels such as Linux
2.4.x, the file was called modules.conf or even conf.modules. You
need to work out what is the name of the file in your particular Linux
distribution. There is also unfortunately no standard location for the
file; the location varies between different Linux distributions. The
file is usually in the directory /etc, but if you are using Debian
Linux, the file is either in the directory /lib/modules or
/etc/modutils. You need to work out where the file is in your
particular Linux distribution.
Assuming you know the name and the location of the modprobe
configuration file, it is easy to add support for ALSA kernel modules.
You just need to edit the file and add a few extra lines to it.
Here are two examples of the ALSA-related part of a modprobe
configuration file. Add the following lines by copying and pasting them
at the bottom of your configuration file but do not erase the existing
contents of the file. The lines that begin with the "#" character are
optional comments only. Note to Debian users only: Afterwards you need
to run update-modules.
Example 1: A modprobe configuration for a Yamaha OPL3SA2 soundcard
# ALSA portion
alias char-major-116 snd
alias snd-card-0 snd-opl3sa2
# module options can go here
# OSS/Free portion
alias char-major-14 soundcore
alias sound-slot-0 snd-card-0
# card #1
alias sound-service-0-0 snd-mixer-oss
alias sound-service-0-1 snd-seq-oss
alias sound-service-0-3 snd-pcm-oss
alias sound-service-0-8 snd-seq-oss
alias sound-service-0-12 snd-pcm-oss
Example 2: A modprobe configuration for a Creative Audigy 2 ZS soundcard
# ALSA portion
alias char-major-116 snd
alias snd-card-0 snd-emu10k1
# module options can go here
# OSS/Free portion
alias char-major-14 soundcore
alias sound-slot-0 snd-card-0
# card #1
alias sound-service-0-0 snd-mixer-oss
alias sound-service-0-1 snd-seq-oss
alias sound-service-0-3 snd-pcm-oss
alias sound-service-0-8 snd-seq-oss
alias sound-service-0-12 snd-pcm-oss
Retrieved from "http://alsa.opensrc.org/Setting_up_modprobe_and_kmod_support"