[alsa-devel] Conexant CX20582 HDA codec support

Takashi Iwai tiwai at suse.de
Mon Jun 29 14:48:08 CEST 2009

At Mon, 29 Jun 2009 13:26:26 +0100,
Mark Brown wrote:
> On Mon, Jun 29, 2009 at 01:10:53PM +0100, Daniel Drake wrote:
> > 1. Volume range is ridiculous, you can go all the way down to -74dB
> > gain.  Beyond -42dB you can barely hear anything from the speakers, and
> > I note that all my other systems only go down as far as -46.5dB.
> This is normally just a case of drivers exposing whatever control they
> get from the hardware.  Devices will often expose very high degrees of
> attenuation since they're doing it anyway in order to implement the mute
> functionality.

Yep.  There are some workaround for each codec chip.
See create_controls_idx() in patch_sigmatel.c, for example.


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