[alsa-devel] Intel card master and PCM channels doesn't work

[Takashi Iwai]

At Thu, 13 Aug 2009 10:55:38 +0300,
Mantas Pilipavičius wrote:
> 
> Can you explain more detailed? What is data manipulation?

You need to change all the stream data multiplying the volume
gain/attenuation in software because you hardware gives no volume
control by itself.

In the case of alsa-lib, it's softvol plugin.  Or, if you use PA,
PA does it automatically.


Takashi

> On Thu, Aug 13, 2009 at 8:41 AM, Takashi Iwai <tiwai at suse.de> wrote:
> 
>     At Thu, 13 Aug 2009 00:39:48 +0300,
>     Mantas Pilipavičius wrote:
>     >
>     > http://www.alsa-project.org/db/?f=
>     afa01dd48ed59d895d18407af62dbd1fa138686c
>     > Everything works great, I can play the sound, but PCM and Master
>     channels
>     > don't work, so I can't increase or decrease volume. Only thing I can do
>     is
>     > mute/unmute PCM channel
>    
>     This hardware has no volume control indeed.
>     The volume has to be adjusted in software by data manipulation.
> 
>     Takashi
> 
>