FC2: No Neomagic Sound

[Joerg Otte]

The on-board soundcard is detected by System-config-souncard:
Neomagic Corporation
Modell: NM2200 (Magic Media 256AV Audio)
Modul: snd-nm256
which should be correct.

Playing the testsound gives me:
 >  amixer: Mixer attach default error: No such device
 >  amixer: Mixer attach default error: No such device
 >  sox: Can't open output file '/dev/dsp': No such device -8

/dev/dsp exist:
 >  [root at erle root]# ll /dev/dsp
 >  crw-------  1 joerg root 14, 3 23. Feb 22:02 /dev/dsp

/var/log/messages shows:
 >  Jun 28 17:15:07 erle kernel: nm256: no ac97 is found!
 >  Jun 28 17:15:07 erle kernel:   force the driver to load by passing 
in the module parameter
 >  Jun 28 17:15:07 erle kernel:     force_ac97=1
 >  Jun 28 17:15:07 erle kernel:   or try sb16 or cs423x drivers instead.
 >  Jun 28 17:15:07 erle kernel: NeoMagic 256: probe of 0000:01:00.1 
failed with error -6

force_ac97=1, sb16, cs423x alltogether doesn't work.

# lsmod
 >  Module                  Size  Used by
 >  snd_pcm_oss            41000  0
 >  snd_mixer_oss          13824  1 snd_pcm_oss
 >  snd_nm256              65064  0
 >  snd_ac97_codec         54788  1 snd_nm256
 >  snd_pcm                69256  2 snd_pcm_oss,snd_nm256
 >  snd_page_alloc          8072  1 snd_pcm
 >  snd_timer              17284  1 snd_pcm
 >  snd                    39396  6 snd_pcm_oss,snd_mixer_oss, 
snd_nm256, snd_ac97_codec, snd_pcm,snd_timer
 >  soundcore               6112  1 snd

Any help will be appreciated.

Joerg