You can check your sound card setup again and read this install file module parameters carefully.
If you have got ISA PnPsound card:
native ISA PnP support: is your setup in /proc/isapnp.conf correct?
isapnptools: is configuration on isapnp.confsame as for the driver?
The driver is not still working: remake driver with:
./configure --with-debug=detect;
make clean
make
Reinsert new driver modules to kernel and look to /var/log/messages if there are some messages. If these messages do not help you, please create a new ticket in our bug reporting Bugs system.
A thumb rule according to Abramo Bagnara about Bugs ,just check whether :
you have seen a Kernel oops
It worked but doesn't work with New Release anymore!
That you strongly suspect for a bug