Re: problems with intel8x0 and 1.0.0pre3 (was: Re: [ANN] ALSA 1.0.0pre1 is released)

[Takashi Iwai <tiwai@suse.de>]

At Thu, 27 Nov 2003 18:16:05 +0200 (EET),
Kai Vehmanen wrote:
> 
> On Wed, 26 Nov 2003, Takashi Iwai wrote:
> 
> >> On the same machine, alsa-driver-0.9.8 works fine, but not with 1.0.0pre1 
> >> and 1.0.0pre3.
> > what do you mean exactly "don't work" in the above?
> > the operation is blocked, or returns an error?
> > if it's blocked, check /proc/asound/card0/pcm0*/sub0/* files.
> 
> I think I found the problem. In 1.0.0preX, the supported sampling rate 
> is limited to 48000Hz and this causes all kinds of problems if running 
> with lower rates (I've mostly tested running at 8000Hz) - i.e. when
> using alsa-lib for sr-conversion.
> 
> With 1.0.0pre3, for example "arecord -r 8000 - |aplay -r 8000 -" produces 
> constant xruns. A similar app that relies on poll()/select(), fails even 
> more severely. When looking at... 
> 
>   /proc/asound/card0/pcm0p/sub0/hw_params and
>   /proc/asound/card0/pcm0c/sub0/hw_params 
> 
> .. the rate is locked to 48000 with 1.0.0pre3. On the same machine with
> 0.9.8, the hw-rate is 8000. I've used the 'default' PCM device in all my
> tests.
> 
> > does this laptop have multiple codecs?  you can find them in
> > /proc/asound/card0/codec97#* directories.
> 
> Nopes, '/proc/asound/card0/codec97#0/ac97#0-0' is the only one,

ok, then the problem is not the multiple codec but the detection of
available sample rates...


Takashi

> and contains:
> --cut--
> 0-0/0: Cirrus Logic CS4299 rev 6
> 
> Capabilities     : -headphone out-
> DAC resolution   : 20-bit
> ADC resolution   : 18-bit
> 3D enhancement   : Crystal Semi 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=0 AMAP DSA=0 VRA
> Extended status  : VRA
> PCM front DAC    : 48000Hz
> PCM ADC          : 48000Hz
> SPDIF Control    : Consumer PCM Category=0x2 Generation=1 Rate=48kHz
> --cut--
> 
> -- 
>  http://www.eca.cx
>  Audio software for Linux!
> 


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