[PlanetCCRMA] Slightly OT: routing sound to the headphone jack on MBP in ALSA

Henrik Frisk frisk.h at gmail.com
Wed Nov 18 14:06:09 PST 2009

On Wed, Nov 18, 2009 at 2:40 PM, Henrik Frisk <frisk.h at gmail.com> wrote:

> Hi,
> I have a relatively new MBP 17'' on which I have FC11 installed. The
> internal sound card has individual ports for the speakers and the line
> out/headphone jack and plugging a jack in the headphone out does not
> automatically re-route the audio. For the most part, I'm quite ok with this,
> in Jack I just choose whatever ports I want to use. But occasionally I want
> an app to route its audio to the headphone jack only. Is there a way to
> change the order of the ports in alsa (I'm assuming that if the headphone
> out was on port 1/2, something like Flash would route its audio to those
> ports by default, but I may be wrong here)? Or does anyone know of another
> work around?
> Thanks for any hints,
> OK, sorry about the noise. I had forgotten about PulseAudio where all of
this is set... FWIW, the alsa driver for the nVidia card in this laptop (MBP
5,2) allows for it to be used in 4ch or 2ch mode. In 2ch mode the sound is
routed to the headphone jack only, and in 4ch mode to both speakers and
headphone (under PulseAudio, running Jack you may choose either or). Modes
are switched in the alsamixer.


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