[alsa-devel] snd-hda-intel, AD 1988b: SPDIF output not working correctly, volume low for analog output

[Takashi Iwai]

At Sat, 18 Aug 2007 14:31:35 +0000 (UTC),
Zig wrote:
> 
> Matthias Dahl <ml_alsa <at> mortal-soul.de> writes:
> 
> > 
> > --- patch_analog.c.orig 2007-07-23 22:44:25.000000000 +0200
> > +++ patch_analog.c      2007-07-23 22:45:15.000000000 +0200
> >  <at>  <at>  -2037,12 +2037,8  <at>  <at> 
> >  static struct hda_verb ad1988_spdif_init_verbs[] = {
> >         /* SPDIF out sel */
> >         {0x02, AC_VERB_SET_CONNECT_SEL, 0x0}, /* PCM */
> > -       {0x0b, AC_VERB_SET_CONNECT_SEL, 0x0}, /* ADC1 */
> > -       {0x1d, AC_VERB_SET_AMP_GAIN_MUTE, AMP_IN_UNMUTE(0)},
> > -       {0x1d, AC_VERB_SET_AMP_GAIN_MUTE, AMP_IN_UNMUTE(1)},
> >         /* SPDIF out pin */
> >         {0x1b, AC_VERB_SET_AMP_GAIN_MUTE, AMP_OUT_UNMUTE | 0x27}, /* 0dB */
> > -       {0x1b, AC_VERB_SET_AMP_GAIN_MUTE, AMP_IN_UNMUTE(0) | 0x17}, /* 0dB */
> > 
> >         { }
> >  };
> 
> > 
> 
> I had similar issues, however patching the file as shown above caused no audio
> output at all on the SPDIF unless it was in AC3 passthrough mode.

Then it must be a usage error.  In the ALSA system, the same stream is
used regardless of audio or non-audio data.

It might be that you set non-audio bit permanently.  Verify with
iecset program in alsa-utils package.


Takashi