At Mon, 02 Feb 2004 17:41:02 +0000,
James Courtier-Dutton wrote:
>
> In alsa 0.9.8, the snd-intel8x0 worked find with my MB. An ICH5 with ALC650.
> With alsa 1.0.2, I get: -
> device: front -> no-sound output
> device: surround40: -> Only sound on rear left, and rear right.
> device: surround51: -> Only sound on rear left, and rear right, center, lfe
>
> So, in all cases there is never sound on the front speakers.
>
> The same problem has happened to a person with an ICH2, which only has
> front speakers, so they get no sound at all.
>
> I am investigating, and I suspect that the mixer has just lost the
> mixer/mute for the front speakers.
hmm, it looks like a generic problem of intel8x0 with ALC65x.
in the recent version, the detection and implementation of PCM streams
have been changed, and i guess it's broken for these codecs.
> Is there a tool where I can adjust ac97 registers directly through a
> IOCTL or something, for test purposes?
% cat /proc/asound/card0/codec97#0/ac97#0-0+regs
we'll need to trace the behavior in snd_ac97_pcm_*() functions...
Takashi
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