Having searched every official and unofficial debian mirror I know of, there are NO alsa modules matching the 2.4.20-xfs kernel that comes with Knoppix. Please note that I also said I couldn't find the kernel headers for 2.4.20-xfs. Nowhere do I find a Debian offering for that kernel, so I thought maybe someone from Knoppix could tell me whence came this apparently non-Debian kernel.

Care to try again?