[Alsa-user] CMI8330

[Bob Y. <pol...@mo...>]

CMI8330; An update....

With the patient help of Takashi Iwai (thanks, Takashi!), I downloaded,
compiled and installed the latest version 0.5 patches to the alsa drivers
from CVS.
I added the following line to my modules.conf:

options snd-pcm-oss snd_dsp_map=1 snd_adsp_map=0

as instructed by Takashi, and that has fixed up OSS emulation to the
extent that all audio apps can now playback through /dev/dsp.  I can also
play CD's - so the playback side of my CMI 8330 is functional.  
The remaining problem is that I cannot record (capture) anything.  The
essence of the problem seems to be that device #0 (SB16) is enabled for
capture only, and device #1 (WSS) for playback only.  Since dsp is now
mapped to device #1, there is no way that apps trying to record using dsp
will succeed.  However, the arecord Alsa utility also fails, even when
using device #0.  There is no error message, and recording is reported as
progressing, however the file created contains no data.  I am very puzzled
by this, as capture works well enough using the OSS/free kernel module sb,
which enables only the SB16 (device #0) for both capture and playback, and
leaves the WSS device completely unused.  In fact, inserting the ad1848
kernel module while the sb module is loaded completely disables sound in a
manner which can only be restored by a reboot.

Alsa seems to handle this problem by configuring all capture to be done in
the SB16 subsystem, and all playback in the WSS.  This would be just fine
if the SB16 would work.....

Any comments, suggestions or advice  - ?

Bob