Problems with sound card

Hello, I am a new Linux user, I just installed last week.
I am sorry for my english but I’m italian; I hope that you understand.
I installed SuSE Linux 11.0 on a laptop, the installation doesn’t give me no problem. But when I listen to music, when I connect the external pc speaker I hear the music from the laptop’s speaker and external speaker. But I want to hear music only from external speaker. How can I do this?
Thank you

Use the mute button on your laptop.
If that does not work - use the sound (speaker icon) in the tray - right click - ‘Mute’

You didn’t say if you were using KDE or GNOME.

But KDE used kmix to control sound. If the speaker icon is not in the try, open a terminal and type:
kmix

That should start it for you. You can scroll the mouse wheel over it to move the volume - right click to manage.

Sometimes this can be fixed with the mixer.

Sometimes, especially for newer hardware, it can not be. In that case one needs possibly to update one’s alsa version. If playing with your mixer did not work, and if you wish to pursue this further, we need more information on your system. To provide more information, with your PC connected to the internet copy and paste the following into a gnome-terminal or konsole:

wget -O alsa-info.sh http://www.alsa-project.org/alsa-info.sh && bash alsa-info.sh 

When the script completes it will pass you a URL. Please post that URL here.

Also, please copy and paste the following into a gnome-terminal or konsole and post the output here.rpm -qa | grep alsa
rpm -qa | grep pulse
rpm -q libasound2
uname -a
cat /etc/modprobe.d/sound

Once you have posted that information, either myself or someone else may be able to provide helpful recommendation(s).