[alsa-devel] Handling of the DXS controls in the via82xx driver

Raymond Yau superquad.vortex2 at gmail.com
Thu Apr 1 01:00:59 CEST 2010

2010/3/29 Soeren D. Schulze <soeren.d.schulze at gmx.de>

> Clemens Ladisch wrote:
> >> The bad thing about it is that 31,31 is a really bad setting for my
> >> poorly engineered sound card.  It distorts a lot.
> >
> > If the card cannot handle any loud output, then all outputs from any
> > source must be restricted, so the logical place for lower volume would
> > be the "Master" or "PCM" controls.
> The problem is rather that it cannot handle loud *input*.  With loud
> input from digital plus the respective DXS lever on high volume, it
> apparently overdrives at a very early stage in the sound card.  Master
> and PCM do not help anything any more.
> The other workaround would probably be using softvol for reducing the
> volume before it enters analog, but lowering the DXS levers is still
> better IMHO.
> Thank you
> Sören
did you set those per voice volume control to 0dB ?

try to play a sine wave of full amplitude and record using analog loopback
of ac97 codec and audacity to find out whether the sine wave is clipped

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