[Debian-eeepc-devel] Volume keys on EEE PC 900

[Fabio Pugliese Ornellas]

http://en.wikipedia.org/wiki/Advanced_Linux_Sound_Architecture#ALSA_features

*Besides the sound device drivers, ALSA bundles a user
space<http://en.wikipedia.org/wiki/User_space>
library <http://en.wikipedia.org/wiki/Library_%28computer_science%29> for
application developers who want to use driver features with a higher level
API than direct interaction with the kernel drivers. Unlike the kernel API
which tries to reflect the capabilities of the hardware directly, ALSA's
user space library presents an abstraction which is as similar as possible
across disparate hardware. It does this in part by using software plugins.
For example, many modern soundcards or built-in sound chips don't have a
"master volume" control; for these devices the user space library provides a
software volume control instead using the "softvol" plugin, and ordinary
application software needn't care about the difference.*

So, it seems that all alsa based drivers do have a Master mixer...

----
Fabio Pugliese Ornellas
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On Sun, Jul 27, 2008 at 08:29, Nico Golde
<debian-eeepc+ml at ngolde.de<debian-eeepc%2Bml at ngolde.de>
> wrote:

> Hi Ben,
> * Ben Armstrong <synrg at sanctuary.nslug.ns.ca> [2008-07-27 11:41]:
> > On Sat, 26 Jul 2008 16:01:08 -0300
> > "Fabio Pugliese Ornellas" <fabio.ornellas at gmail.com> wrote:
> > > Well, all sound cards I've ever seen until today, have a 'Master'
> channel.
> > > This is why I bet it would work on any system.
> >
> > And this may be true for current kernels.
> >
> > Nico, recall that when we switched kernels, labels changed.  Perhaps
> > 'Master' is good for all models now?  At least on my 701 with 2.6.25 it
> > is correct, and 900 users are telling us it is correct.  Is it
> > different for you?
> >
> > The only other way it might be different is if you force a model= when
> > the module is loaded.  But I don't think that is needed any more for
> > 2.6.25 ...
>
> So there is no way to set the channel apart from the kernel?
> I always thought that this might get setup also by parts of
> the hardware itself. If not fine, then let's change it :)
>
> Cheers
> Nico
> --
> Nico Golde - http://www.ngolde.de - nion at jabber.ccc.de - GPG: 0x73647CFF
> For security reasons, all text in this mail is double-rot13 encrypted.
>
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