Re: [gentoo-amd64] Re: sudden sound loss

["Mark Knecht" <markknecht@gmail.com>]

On Fri, Apr 11, 2008 at 4:33 AM, Raffaele BELARDI
<raffaele.belardi@st.com> wrote:
> On Fri, 2008-04-11 at 07:16 -0400, Mark Haney wrote:
>  > Well for me, the trick in alsamixer is to look at the bottom of each
>  > 'bar graph' and see if it has 'MM' in it instead of the infinity symbol.
>  >   I am pretty sure that's a standard set of symbols for that.  The 'MM'
>  > is for muted' and the infinity symbol is for unmuted.
>  >
>
>  I have a question related to alsamixer, although not related to the
>  subject.
>
>  On my box with VIA chipset, alsamixer has a 'spread front to surround'
>  control that duplicates the same signal on front and surround output
>  jacks.
>
>  There is no similar control on the box with the NVIDIA 430. Is it a
>  configuration problem on my side? Anybody know how could I obtain the
>  same effect without that control?
>
>  raf
>

The controls shown in alsamixer are based on hardware features
revealed by the driver. My guess is that the nvidia 430 doesn't have
this feature, or it's driver hasn't turned it on by default. Possibly
there is a module parameter switch that shows up with modinfo that you
could play with?

If you think the hardware supports this feature but the driver isn't
enabling it then your best bet would be to contact the alsa developers
to look for some support. (Or do it yourself if you have the skill
set!)

cheers,
Mark
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