Try:

' sudo modprobe snd_sun_cs4231 ' to load the module. When I did this in a GNOME Terminal window, I instantly got a message on screen that new sound hardware had been detected and that it was now ready to be configured.

To have the module loaded during startup, you have to manually append a line with snd_sun_cs4231 to /etc/modules:

' # /etc/modules: kernel modules to load at boot time. # # This file contains the names of kernel modules that should be loaded # at boot time, one per line. Lines beginning with "#" are ignored. snd-sun-cs4231 '