[alsa-devel] [PATCH 1/2] opti93x: add support for Opti93x codec in cs4231-lib

Krzysztof Helt krzysztof.h1 at poczta.fm
Sun Jun 15 19:33:25 CEST 2008

On Tue, 10 Jun 2008 01:21:43 +0200
Rene Herman <rene.herman at keyaccess.nl> wrote:

> The mixer levels do seem different between the old and new driver. Does 
> that make sense? The new one appears to  be a bit louder so there might 
> be an offset issue somewhere I suppose. I didn't compare that closely.

I have tried to reproduce this on an opti930 card. I do not hear any difference.
I tried at 100% and 75% (both PCM and Master) levels. I used the script which
reloaded an old and new driver and played a wav file. I run it in a loop.
The thing I noticed is that the old driver often produced noise (say more
than 1 in 4 tries) instead of the sound. The new driver (cs4231) never. The old
and new driver produced a click before playing the sound (50% probability).

I have checked the mixer code. It is not changed.

What do you do to get a different sound level? (card model, level settings).


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