Pretty good guidance for troubleshooting sound issues can be found here:
http://ubuntuforums.org/showthread.php?t=205449
EXCEPT for Dell Latitude Laptops, D5xx and D6xx, for which you need this one:
http://users.piuha.net/martti/comp/d630/
EDIT: 18 NOV 2008 -- To gain a better understanding of how to set /etc/modprobe.d/sound for multiple or changed sound cards, read the official ALSA guidance in the compressed file /usr/share/doc/alsa-base/README.Debian.gz.
http://ubuntuforums.org/showthread.php?t=205449
EXCEPT for Dell Latitude Laptops, D5xx and D6xx, for which you need this one:
http://users.piuha.net/martti/comp/d630/
EDIT: 18 NOV 2008 -- To gain a better understanding of how to set /etc/modprobe.d/sound for multiple or changed sound cards, read the official ALSA guidance in the compressed file /usr/share/doc/alsa-base/README.Debian.gz.
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