|Red Hat Enterprise Linux 4: Red Hat Enterprise Linux Step By Step Guide|
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If, for some reason, you do not hear sound and know that you do have a sound card installed, you can run the Sound Card Configuration Tool utility.
To use the Sound Card Configuration Tool, choose Applications => System Settings => Soundcard Detection. A window opens, prompting you for your root password.
Most sound cards are supported by Red Hat Enterprise Linux, but there are some sound cards that are not completely compatible or may not work at all. If you are having trouble configuring your sound card, check the Hardware Compatibility List at http://hardware.redhat.com/hcl/ to see if your card is supported.
The Sound Card Configuration Tool utility probes your system for sound cards. If the utility detects a plug and play sound card, it automatically tries to configure the correct settings for your card. You can then click the Play test sound button to play a sound sample. If you can hear the sample, select OK and your sound card configuration is complete.
It is possible that your sound has been muted. To check this, click on the Volume Control icon on the top Panel. Check the Volume Control application available from the Applications (the main menu on the panel) => Sound & Video => Volume Control. If any of the mute boxes have been checked, un-check them and try the Sound Card Configuration Tool again.
If the Sound Card Configuration Tool does not work (if the sample does not play and you still do not have audio sounds), there are alternatives, although they are not quite as simple as running the Sound Card Configuration Tool. You can edit your modules.conf file as discussed in the next section (this strategy is not recommended for most new users) or refer to the documentation that came with your sound card for more information.
If your sound card is not a plug and play card, you can manually edit your /etc/modules.conf file to include the sound card module that it should use. You must have root privileges to alter this file. The following is an example of the text to add to your /etc/modules.conf file:
alias sound sb alias midi opl3 options opl3 io=0x388 options sb io=0x220 irq=7 dma=0,1 mpu_io=0x300
For information on configuring sound manually, refer to the Linux Sound HOWTO at the Linux Documentation Project webpage: