Sound problem AMD Geode LX800

Hi,

I'm building a distro with the board PCM-9375, but my sound card dont work.

In the path /proc/asound I have:
card0 cards devices Audio modules oss pcm seq timers version
When I type cat cards it show:
# ls -l Audio:
Audio -> card0
# cat cards:
0[Audio ] cs5535audio - cs5535 Audio
CS5535 Audio cs5535audio at 0xfe00, irq 15
# cat devices:
2: : timer
3: : sequencer
4: [ 0- 0] : digital audio playback
5: [ 0- 0] : digital audio capture
6: [ 0 ] : control
# cat modules:
0 snd_cs5535audio
# cat pcm:
00-00 CS5535 Audio : CS5535 Audio : playback 1 : capture 1
# cat timers:
P0-0-0: PCM playback 0-0-0 : SLAVE
P0-0-1: PCM capture 0-0-1 : SLAVE
# cat version:
Advanced Linux Sound Architecture Driver Version 1.0.18a.


And the path /proc/asound/card0:
codec97#0
id
oss_mixer
pcm0c
pcm0p

These files seem nice but i cat hear sound.

When a type: cat /dev/urandom > /dev/audio
Nothing happens...

I load these modules:

# insmod soundcore.ko
# insmod sound_firmware.ko
# insmod snd.ko
# insmod snd-seq-device.ko
# insmod snd-rawmidi.ko
# insmod snd-mpu401-uart.ko
# insmod snd-page-alloc.ko
# insmod ac97_bus.ko
# insmod snd-timer.ko
# insmod snd-pcm.ko
# insmod snd-ac97-codec.ko
# insmod snd-mixer-oss.ko
# insmod snd-pcm-oss.ko
# insmod cs5535audio/snd-cs5535audio.ko
# insmod seq/snd-seq.ko
# insmod snd-seq-dummy.ko
# insmod snd-seq-midi.ko
# insmod snd-seq-midi-event.ko
# insmod snd-seq-midi-emul.ko
# insmod snd-seq-oss.ko

When I type:

# cat /dev/sndstat:
Sound Driver:3.8.1a-980706 (ALSA v1.0.18a emulation code)
Kernel: Linux xxxxxx i586
Config options: 0

Installed drivers:
Type 10: ALSA emulation

Card config:
CS5535 Audio cs5535audio at 0xfe00, irq 15

Audio devices:
0: CS5535 Audio (DUPLEX)

Synth devices: NOT ENABLED IN CONFIG

Midi devices: NOT ENABLED IN CONFIG

Timers:
31: system timer

Mixers:
0: Realtek ALC203 rev 0
---------------------------------------------------

I have to do something in the kernel? I am forgetting something ? I m new in the compile kernel, i dont know if have more things to enable sound..


thnaks.
fmnovais.

I had the same problem with a Geode LX800 from Winsystems.

I had to hack the kernel driver to make it work.

My problem was that the mixer was not configured properly. Your board does not use the same mixer than mine so my patch will not work.

Their is a number of thing to check. Check if your speaker out if physically connected to the main out or the headphone out of the realtehk chip. If that is the case, you have to load the AC97 codec with an argument(see kernel doc)

If that is not the case, here is how I debuged mine:

Compile the AC97 with debug info so you have:
/proc/asound/card0/codec97\#0/ac97\#0-0\+regs

Get the program mixer.c
http://www.oreilly.de/catalog/multil...pt/ch14-07.htm
this allow you to change mixer value from shell

This gives you the AC97 register:
02 is your master output, should vary when you vari the master mixer
18 is your PCM output level, should vary when you vari the PCM mixer

my problem was than when I was doing
# mixer pcm 100
the register 18 was not modified accordingly.

Hope this help.


In the meanwhile, if someone could tell me how to get in touch with ALSA AC97 kernel driver coder so that I could talk about my patch...