Apparently your soundcard cant be auto probed. So, you need to pass options to the driver when it is loaded.
5.3.4. CS4235/CS4236/CS4236B/CS4237B/CS4238B/CS4239 chips
According to the INSTALL file you need to supply the main port and
control ports for this card. Note that with a CS4237B card, I ended up
supplying all information (except DMA-size), otherwise the driver did
not work. So you may as well use the whole command line to insert the
driver, and not only supply snd_port and snd_cport. If you initialized
the card with the isapnp-tools, you can probably get info from the
/etc/isapnp.conf file for the following values:
snd_port - port # for CS4232 chip (PnP setup - 0x534)
snd_cport - control port # for CS4232 chip (PnP setup - 0x120)
snd_mpu_port - port # for MPU-401 UART (PnP setup - 0x300), -1 = disable
snd_fm_port - FM port # for CS4232 chip (PnP setup - 0x388), -1 = disable
snd_jport - joystick port for CS4232 chip (PnP setup - 0x200), -1 = disable
snd_irq - IRQ # for CS4232 chip (5,7,9,11,12,15)
snd_mpu_irq - IRQ # for MPU-401 UART (9,11,12,15)
snd_dma1 - first DMA # for CS4232 chip (0,1,3)
snd_dma1_size - max first DMA size in kB (4-64kB)
snd_dma2 - second DMA # for Yamaha CS4232 chip (0,1,3), -1 = disable
snd_dma2_size - max second DMA size in kB (4-64kB)
You would do a "modprobe snd-card-cs4236 snd_port=0x534
snd_cport=0x120 snd_mpu_port=-1 snd_fm_port=0x388 snd_jport=-1
snd_irq=5 snd_dma1=0 snd_dma1_size=NN snd_dma2=1 snd_dma2_size=NN" to
load the driver. (Without midi-support, see the note at Yamaha OPL-3,
and no joystick support). Notes:
· the "NN" values need to be supplied, only I do not know what would
be reasonable values.
· my CS4237B works fine without explicit dma size option.
Have a go at that and come back if you dont get it to work, letting us know what you did and what happened.
This info was all taken from here
Hope it helps and good luck