Headphone + external speaker working together

Hello all!!I have a VAIO VGN-C1S whre I installed ubuntu and everything is perfect except for the fact that when I plug in my headphone the sound keeps coming out from the normal laptop speaker... I mean, I get sound from both!!! I have searched the web and I've found all kinds of problems about "no sound", but my problem is just the oposite....Does anybody knows something about it??PS: In case it helps, aplay -ll gives me this:**** List of PLAYBACK Hardware Devices ****card 0: Intel [HDA Intel], device 0: ALC262 Analog [ALC262 Analog]  Subdevices: 1/1  Subdevice #0: subdevice #0

I have the same problem than you, can you or anybody help me?

I have the same problem than you, but it site of a VAIO in a SAMSUNG R60P, but the sound board is the same an the problem is the same, anybody can help me?.PD:I'm spanish and my english isn't very g

i solvent the problem

in the kmix i disable the front output soud channel.