Intel Corporation 82801 AC'97 Audio Controller not working

Hi everyone.
Since I installed netbsd 4.0, my sound card won't work. I tried a whole 
bunch of kernels ( GENERIC and LAPTOP, 4.0 and current from 
ftp://ftp.netbsd.org/pub/NetBSD-daily/HEAD/200801090002Z/i386/binary/kernel/ 
), but no way to get sound...
I guess I should try to build my own kernel, but what options should I 
change ?
scanpci gives :

pci bus 0x0000 cardnum 0x1f function 0x05: vendor 0x8086 device 0x24c5
 Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) AC'97 Audio Controller

dmesg gives :

auich0 at pci0 dev 31 function 5: i82801DB/DBM (ICH4/ICH4M) AC-97 Audio
auich0: can't map codec i/o space

If anyone has an idea, i'll try.
Best regards,
Trusiad