[CentOS] dual sound

On 07/29/11 11:22 AM, m.roth at 5-cent.us wrote:
> And I've had the external speakers jacked in both in the front
> "headphones" jack, and the traditional one in the back, and sound comes
> both out of the external speakers and a speaker inside the machine.

sound cards have a myriad of different ways they can be connected to 
outputs....  its possible your motherboard's audio mixer has a output to 
the internal speaker.   usually these can be controlled via a 'mixer' 
program, but the sound drivers have to know exactly what hardware is 
connected where on the outside of the core audio chip for all this to 
work sanely.



-- 
john r pierce                            N 37, W 122
santa cruz ca                         mid-left coast