Macbook Pro 13.3" (5,5) Fedora 12 notes

Adam Williamson awilliam at
Thu Apr 8 20:58:22 UTC 2010

On Thu, 2010-04-08 at 13:35 -0400, Jon Masters wrote:

> > > Then alsamixer will show all of the channel options, which you should
> > > set to 100% volume for now.
> > 
> > alsamixer -c 0
> > would have done the same thing.
> It would? Doesn't the ALSA plugin always end up hiding things PA doesn't
> think you need? 

No. PA doesn't 'hide' anything from the ALSA interfaces (and hence
tools). It's just that, with alsa-plugins-pulseaudio installed, the
default ALSA device is not your physical sound card, but the virtual
device PA creates. Plain 'alsamixer' always shows you the default ALSA
device (all ALSA tools assume the default ALSA device if you don't
specify some particular device), so if you just do 'alsamixer' you're
not seeing some PA-nerfed view of the controls on your actual hardware
adapter, you're seeing the actual complete set of ALSA controls that
exists on the PA 'card' (which, obviously, isn't many). 'alsamixer -c0'
just tells it to show you the control for card 0, instead, which will
usually be the actual hardware adapter you want to adjust (on systems
with multiple hardware sound devices you may have to go with -c1 or -c2
Adam Williamson
Fedora QA Community Monkey
IRC: adamw | Fedora Talk: adamwill AT fedoraproject DOT org

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