SiS sound problem

[Jaanus J6gisu]

Hi
When I kldload snd_ich

g550# kldload snd_ich
g550# kldstat
Id Refs Address    Size     Name
 1    9 0xc0400000 5cdad0   kernel
 2   14 0xc09ce000 537f0    acpi.ko
 3    1 0xc185d000 17000    linux.ko
 4    1 0xc1e15000 5000     snd_ich.ko
 5    1 0xc1e1a000 18000    sound.ko

I can use the soundcard, but the processor usage is extremely high.

USER     PID %CPU %MEM   VSZ  RSS  TT  STAT STARTED      TIME COMMAND
root      22 44.9  0.0     0   12  ??  RL   12:42PM   0:41.77 [irq11: 
cbb0 pcm0

These are the dmesg and cat outputs.

pcm0: <SiS 7012> port 0xd800-0xd87f,0xdc00-0xdcff irq 11 at device 2.7 
on pci0
pcm0: [GIANT-LOCKED]
pcm0: <Avance Logic ALC202 AC97 Codec>
g550# cat /dev/sndstat
FreeBSD Audio Driver (newpcm)
Installed devices:
pcm0: <SiS 7012> at io 0xdc00, 0xd800 irq 11 bufsz 16384 kld snd_ich 
(1p/1r/0v channels duplex default)

kldload snd_driver gives the same result, it loads the same driver.

Computer is ECS laptop, with integrated SiS sound card.
Any idea how I could get it to work properly? Googling didnt help much.

Thank you in advance.