[Alsa-user] using dmix causes silent output with snd-cs46xx (1.0.10rc1)

[Joel B. <bp...@gm...>]

Hi, all--

I'm having some interesting trouble getting dmix to work properly with
snd-cs46xx, using the 1.0.10rc1 bundled with 2.6.14.3 kernel.  If I
run two instances of "alsaplayer -o alsa -d plug:dmix file.mp3", they
both appear to run properly (e.g., time and progress meters increase),
but no sound is produced.  Using dmix via asound.conf behaves
similarly.  Alsaplayer plays fine when allowed to have exclusive
access to the sound device (i.e., with no "-d plug:dmix"), but a
second such instance blocks until the first exits.

A subquestion here is: why is concurrency not working automatically,
without "-d plug:dmix"?  I read that my >=3D 1.0.9rc2 ALSA defaults to
using dmix for non-hardware-mixing soundcards, which includes my
CS4624-based Cirrus Logic soundcard (as per the soundcard matrix).  Is
that maybe the real problem, with the explicit dmix just confusing
things?

Anyway, here're my kernel-config *_SND_* entries (complete config at
http://kofight.com/config-2.6.14.3):

CONFIG_SND=3Dm
CONFIG_SND_TIMER=3Dm
CONFIG_SND_PCM=3Dm
CONFIG_SND_HWDEP=3Dm
CONFIG_SND_RAWMIDI=3Dm
CONFIG_SND_SEQUENCER=3Dm
CONFIG_SND_SEQ_DUMMY=3Dm
CONFIG_SND_OSSEMUL=3Dy
CONFIG_SND_MIXER_OSS=3Dm
CONFIG_SND_PCM_OSS=3Dm
CONFIG_SND_SEQUENCER_OSS=3Dy
CONFIG_SND_GENERIC_DRIVER=3Dy
CONFIG_SND_DUMMY=3Dm
CONFIG_SND_VIRMIDI=3Dm
CONFIG_SND_AC97_CODEC=3Dm
CONFIG_SND_AC97_BUS=3Dm
CONFIG_SND_CS46XX=3Dm
CONFIG_SND_CS46XX_NEW_DSP=3Dy
CONFIG_SND_USB_AUDIO=3Dm

... and stuff from /proc/asound:

bash-3.00$ cat modules
0 snd_cs46xx
bash-3.00$ cat cards
0 [CS46xx         ]: CS46xx - Sound Fusion CS46xx
                     Sound Fusion CS46xx at 0x50100000/0x50000000, irq 11
bash-3.00$ cat devices
  8: [0- 0]: raw midi
 16: [0- 0]: digital audio playback
 24: [0- 0]: digital audio capture
  0: [0- 0]: ctl
 33:       : timer
bash-3.00$ cat ./card0/pcm0p/info
card: 0
device: 0
subdevice: 0
stream: PLAYBACK
id: CS46xx
name: CS46xx
subname: subdevice #0
class: 0
subclass: 0
subdevices_count: 1
subdevices_avail: 1
bash-3.00$

Oh, and an asound.conf (adapted from the Dmix wiki entry) is at
http://kofight.com/asound.conf.

Thanks in advance for any assistance.  Please let me know if any
further information, tests, etc. would be useful.

Joel