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Red Hat Linux 9 Audio Driver Installation Guid
Version 0.82, October 23, 2003
Copyright . 2001, 2002, 2003 VIA Technologies, INC.
1. Summary
This document describes four methods of installing the audio driver for VIA south
bridge chips VT8231, VT8233, VT8233A, VT8235 and VT8237 under Red Hat
Linux 9. These methods include:
(1) OS built-in driver (only for VT8231)
(2) ALSA driver from the Advanced Linux Sound Architecture project
(3) OSS driver from 4Front Technologies.
(4) VIA’s Audio Driver
The step-by-step instruction for each method and a comparison of their respective
features are provided. The VIA Linux Audio Driver supports 6 channel output as well
as VIA’s Smart 5.1, the so-called the Intelligent 6 Channel Audio technology. The
information in this document is provided “AS IS,” without guarantee of any kind.
2. File description
This package contains 8 files as described below.
07-24-03 11:18 26,903 bytes Linux_Audio_V230.zip VIA V2.30 Driver
10-20-03 17:54 1,645,407 bytes alsa-driver-0.9.7c.tar.bz2 ALSA 0.9.7 Driver
10-20-03 17:57 524,259 bytes alsa-lib-0.9.7.tar.bz2 ALSA 0.9.7 Library
10-20-0311:21 108,681bytes alsa-utils-0.9.7.tar.bz2 ALSA0.9.7 utility
01-22-03 14:54 306 bytes alsaconf
11-23-01 08:18 350 bytes audunmute
10-20-03 18:18 3,853,837 bytes oss398a-linux-v2x.tar.gz OSS Driver
Readme.doc this file
The ALSA driver packages are maintained by the Advanced Linux Sound
Architecture project, and users are advised to download the latest version from
http://www.alsa-project.org/. The Open Sound System (OSS) driver is maintained by
4Front Technologies, and users may download the latest evaluation version from
http://www.opensound.com/; however, using the OSS driver may require a fee.
3. Prior to installation preparation
Before installing any audio driver, you should do two things. First, remove the
previously installed driver by following the steps below.
(1) OS built-in
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# modprobe –r via82cxxx_audio
(2) ALSA
# modprobe –r snd-pcm-oss
# modprobe –r snd-seq-oss
# modprobe –r snd-mixer-oss
# modprobe –r snd-via82xx (ALSA 0.9.7)
(3) OSS
Method 1:
# cd /usr/lib/oss
# ./soundoff (turn off the OSS audio driver)
Method 2:
# cd /usr/lib/oss
# ./uninstall.sh (uninstall the OSS audio driver)
(4) VIA
# rpm –e viaudiocombo-2.3-1
Next, if you have other vendors’ drivers installed as well, backup the
“/etc/modules.conf” file. In case you make any mistake, you can always use the file
to restore your system back to the initial configuration. Note before removing the
previously installed driver, terminate any sound related applications and make sure
your sound card is no longer in use. Run the “# lsmod” command to confirm whether
the audio driver is loaded.
4. OS built-in driver (only for VT8231)
The OS will automatically detect the on-chip audio controller and install the driver
for it. To verify whether the driver is installed, run “# lsmod” in the command line to
check if the audio module is loaded into kernel. If it was loaded, you should see the
module named “via82cxxx_audio” and its size. The OS built-in driver works fine in
VT8231 chip, but it has some problem in VT8233, VT8233A, VT8235, and VT8237
chips.
5. ALSA driver
(1) Prepare kernel source code
The kernel-headers and kernel-source are both required for rebuilding the audio
kernel module. You can select the source during your first installation process by
checking the box /Package Group Selection/Development/Kernel Development
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/Standard Packages/kernel-source. Alternatively, you may install the kernel
source anytime by selecting “Add or Remove Packages” tool from the /Program/
System Settings in GNOME/ KDE, or run “rpm –ivh
kernel-source-2.4.20-8.i386.rpm” command to install from the second
installation CD under the path “/RedHat/RPMS/”.
(2) Download and decompress the ALSA package
Download and decompress the package in a directory you specify, for example,
by using the following command.
# tar xjvf alsa-driver-0.9.7c.tar.bz2
(3) Create sound devices
Change directory to “alsa-driver-0.9.7”, and run the following commands to
create new sound devices in the /dev directory and probe the audio controller.
# ./configure –-with-kernel=/usr/src/linux-2.4
# make
# make install
# ./snddevices
(4) Red Hat Linux 9 conflicts with ALSA wrapper code (optional)
Before you load the module, due to the conflict between Red Hat Linux 9 and the
ALSA driver, you may encounter problems while installing the ALSA driver.
Follow the steps of the workaround below to run the make install again:
# make clean
# touch include/linux/workqueue.
h
# make; make install
You have two choices to load the audio module into kernel: manually or automatically.
If manually, go to Step 5, otherwise, go to Step 6.
(5) Manually load the audio modules
Run the “modprobe” command to load the necessary audio modules into kernel.
# modprobe snd-via82xx dxs_support=
1
# modprobe snd-mixer-oss
# modprobe snd-seq-oss
# modprobe snd-pcm-oss
The reason to load the "snd-via82xx" modules with specifying "dxs_support=1"
is to allow each stream to set the VRA due to some noise discovered while using
the driver. However, after system reboot the audio modules no longer exist in the
kernel; you need to manually re-load them again.
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(6) Automatically load the audio modules
You need to edit and add the following lines to the “/etc/modules.conf” file. The
audio and associated modules will be automatically loaded into the kernel upon
the use of any audio applications.
alias char-major-116 snd
alias snd-card-0 snd-via82xx
alias char-major-14 soundcore
alias sound-slot-0 snd-card-
0
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
A sample configuration file “alsaconf” is provided in this package for your
convenience.
(7) Use the mixer to enable audio features
The audio features in the ALSA driver are muted by default. You may use either
the KMIX or the ALSA mixer to enable them. The KMIX is easy to use and thus
is recommended.
(a) Use the KMIX mixer (recommended)
The mixer implements a GUI interface for users to adjust the sound level. Run
the KMIX (selecting through Programs/Sound & Video/ Sound Mixer) to
adjust settings. However, after system reboot the end user needs to run the
KMIX again to enable the audio driver; otherwise, the audio driver will be
muted. Once the KMIX is activated, the previously audio settings will
automatically take into effect.
(b) Use the ALSA mixer
Download and use the following instructions to install the ALSA library and
utilities. First, decompress them in the directory you specify.
# tar xjvf alsa-lib-0.9.7.tar.bz2
# tar xjvf alsa-utils-0.9.7.tar.bz2
Then change directory to “alsa-lib-0.9.7” and “alsa-utils-0.9.7”
respectively and run the following commands.
# ./configure; make; make install
After installing the ALSA utilities successfully, execute “# amixer”. You will
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see that all options are muted by default. Run the following 12 commands to
un-mute and set the sound level.
# amixer set PCM 22 unmute
# amixer set PC\ Speaker 22 unmute
# amixer set Master 22 unmute
# amixer set Master\ Mono 22 unmute
# amixer set Headphone 22 unmute
# amixer set Phone 22 unmute
# amixer set Aux 22 unmute
# amixer set Video 22 unmute
# amixer set CD 22 unmute
# amixer set Input\ Gain 22 unmute
# amixer set Line 22 unmute
# amixer set MIC 22 unmute
For your convenience, the “audunmute” script file is provided in this package.
You may run the following command to enable all the audio function.
# ./audunmute
Note if you cannot run the “audunmute” command, make sure to change its
attributes by the “chmod 755” command. After system reboot the audio driver
will be muted; the end user needs to run the “audunmute” again to enable the
audio driver.
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