At Sun, 25 Jan 2004 15:25:49 +0100,
Daniel wrote:
> 
> Greetings,
> 
>    I have recently bought a Shuttle SN41G2 with an onboard i810 chipset. 
> I'm running a SuSE 9.0, and replaced the default OSS driver with ALSA 
> 1.0.1.
> 
> I redirected all my sound output through the SPDIF interface using 
> /etc/asound.conf :
> 
>    pcm.nforce-hw {
>    type hw
>    card 0
>    }
> 
> 
>    pcm.!default {
>    type plug
>    slave.pcm "nforce
>    }
> 
>    pcm.nforce {
>    type dmix
>    ipc_key 1234
>    slave {
>    pcm "hw:0,2"
>    period_time 0
>    period_size 1024
>    buffer_size 4096
>    rate 44100
>    }
>    }
> 
>    ctl.nforce-hw {
>    type hw
>    card 0
>    }
> 
> Yet the SPDIF output remains locked at 48 KHz, and so the sound is 
> usually slightly altered :
> 
>    abyss:/etc # more /proc/asound/nForce2/codec97#0/ac97#0-0
>    0-0/0: Realtek ALC650 rev 2
> 
>    Capabilities     :
>    DAC resolution   : 20-bit
>    ADC resolution   : 18-bit
>    3D enhancement   : Realtek 3D Stereo Enhancement
> 
>    Current setup
>    Mic gain         : +0dB [+0dB]
>    POP path         : pre 3D
>    Sim. stereo      : off
>    3D enhancement   : off
>    Loudness         : off
>    Mono output      : MIX
>    Mic select       : Mic1
>    ADC/DAC loopback : off
>    Extended ID      : codec=0 rev=1 LDAC SDAC CDAC DSA=0 SPDIF DRA VRA
>    Extended status  : SPCV LDAC SDAC CDAC SPDIF=7/8 SPDIF VRA
>    PCM front DAC    : 48000Hz
>    PCM Surr DAC     : 48000Hz
>    PCM LFE DAC      : 48000Hz
>    PCM ADC          : 44100Hz
>    SPDIF Control    : Consumer PCM Category=0x2 Generation=1 Rate=48kHz
>    SPDIF In Status  : Not Locked
> 
> How can I control the SPDIF output through alsa?

so far, nforce spdif supports only 48k.
it seems like a hardware limitation.  use simply 48k in the above
configuration.


Takashi


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