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I think that what is being asked for here is the ability to turn off the headphones even though something is plugged in. It is understood that both speakers and headphones cannot be driven at the same time. The question is whether the switch is mechanical, making it impossible to turn on the speakers if a headphone jack is inserted, or if the switch is electronic, meaning that it can be overridden in software to direct the audio to one or the other under user control. Seems like if the boot chime can be directed to the speaker even when a headphone jack is in place, then it should be possible to direct other audio to the speakers in the same situation.
Brian Willoughby Sound Consulting
On Feb 22, 2008, at 18:53, Jeff Moore wrote: On Feb 22, 2008, at 6:46 PM, Paul Haddad wrote: Is it possible in the non-general case?
Not that I'm aware of. The Mac Book Pro I tested had only one output device that was driving both the speaker and the headphones. And, the speaker and the headphones are completely mutually exclusive. I know that or example on my mbp it seems like this might be possible, since when the headphones are plugged in and I reboot I hear the reboot chime through the external speakers.
The boot chime always comes out of the speaker on Intel machines.
Thanks for the response!
On Fri, Feb 22, 2008 at 8:07 PM, Jeff Moore < email@hidden> wrote: Generally, this isn't possible. On most of our hardware, the headphones and the speaker are driven from the same device and are mutually exclusive. On Feb 22, 2008, at 5:55 PM, Paul Haddad wrote: I keep getting requests to have PTHVolume (http://pth.com/products/pthvolume) support the ability to switch the Audio Output to built in speakers even if a headphone is connected. I know the hardware technically supports this but is this something that can be controlled via CoreAudio or is it locked up in the Kernel Driver and thus practically inaccessible?
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