Disable sound through HDMI permanently

I'm running Ubuntu 10.10 on my laptop using an external monitor. The monitor is connected by a HDMI cable. The external monitor does not have boxes, it does have an audio exit for a headphone/.. .

Now when I plug in my external monitor, I want to keep using my laptops boxes. Now it automatically sends the sound through the HDMI port instead.

I can easily change the appropriate settings in the sound configuration menu: I go to hardware and can select the device I want to use: Analog Surround 4.0 Output, instead of the HDMI one. This works and I can hear sound through my laptop boxes.

But I have to change this setting every time again when I plug in my external monitor, when I wake my laptop from the suspended state, etc.

How can I make this the default setting, without having to reset it all the time?

Thanks!

Ubuntu 10.10 is somehow not really up-to-date which makes it a bit hard to confirm the default pulseaudio installation there. However it may be worth to see if you have the module-switch-on-port-available loaded.

In case it is there, then try to disable it by commenting out (#) the following line in your /etc/pulse/default.pa:

# load-module module-switch-on-port-available

After the next restart of the pulseaudio server (e.g. with pulseaudio -k in a terminal) we should no longer switch to a different audio port when this becomes available (e.g. by plugging in your HDMI cable).