I had some problems with my sound card as well. The reason it is grayed out is because it's set up to use modules. What you have to do is determine what driver you need and load the proper module in. There's instructions in the sound how-to
here.
Quote:
You can check which drivers are available as modules by looking in the /lib/modules directories. For the 2.4.4 kernel, the sound drivers would normally appear in /lib/modules/2.4.4/kernel/drivers/sound/. If you see the driver(s) for your sound card, you can try using the module directory and skip recompiling the kernel. <snip>
[I]t is a good idea to read the relevant documentation included with the kernel sound drivers, particularly information specific to your card type. The files can be found in the kernel documentation directory, usually installed in /usr/src/linux/Documentation/sound. <snip>
If you are using loadable kernel modules for sound (you are), you will need to load them using the modprobe command for the appropriate drivers, e.g. run the command for a SoundBlaster card.
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I recommend reading through the entire sound how-to, and for usability, go
here. There's a bunch more info in the how-to, and there's a list
here about sound card compatibility. I know it's for Red Hat, but it will also tell you what driver to use for your card. Hope this helps!
-Infamous-Tim-