[alsa-devel] PCM Volume on FSC V5505

[Jan-Simon Möller]

The levels were  0-43 on Master and PCM.
When PCM was over 20 it sounded ugly.
Your patch fixed it with PCM. 
Master now 0-43, PCM now 0-20 .
What about the inputs are they affected before/after the patch ?

Many thanks !

Best regards
Jan-Simon


Am Dienstag 27 November 2007 16:23:08 schrieb Takashi Iwai:
> At Tue, 27 Nov 2007 16:19:56 +0100,
>
> I wrote:
> > At Fri, 23 Nov 2007 17:45:21 +0100,
> >
> > Jan-Simon Möller wrote:
> > > Hi !
> > > With the patches, the sound works - well done!
> > > But I need to make sure the PCM volume is max @ 50% .
> > > If its over 50% sound is clipped and ugly (overload?).
> >
> > Looks like so.  Mixer apps (e.g. alsamixer) can show its dB value
> > instead of percent.  Check the dB level shown there.
> >
> > The patch below may fix this issue.  Give it a try.
>
> Argh, the patch is wrong.  Use the below instead.
>
>
> Takashi
>
> diff -r 17223a4918b4 pci/hda/patch_conexant.c
> --- a/pci/hda/patch_conexant.c	Tue Nov 27 15:27:17 2007 +0100
> +++ b/pci/hda/patch_conexant.c	Tue Nov 27 16:50:37 2007 +0100
> @@ -826,6 +826,17 @@ static int patch_cxt5045(struct hda_code
>  		spec->init_verbs[0] = cxt5045_test_init_verbs;
>  #endif
>  	}
> +
> +	/*
> +	 * Fix max PCM level to 0 dB
> +	 * (originall it has 0x2b steps with 0dB offset 0x14)
> +	 */
> +	snd_hda_override_amp_caps(codec, 0x17, HDA_INPUT,
> +				  (0x14 << AC_AMPCAP_OFFSET_SHIFT) |
> +				  (0x14 << AC_AMPCAP_NUM_STEPS_SHIFT) |
> +				  (0x05 << AC_AMPCAP_STEP_SIZE_SHIFT) |
> +				  (1 << AC_AMPCAP_MUTE_SHIFT));
> +
>  	return 0;
>  }
>
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-- 
Jan-Simon Möller
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