How to disable the internal speaker in Lucid

[william drescher]

On 6/1/2010 4:03 AM, Amichai Rotman wrote:
> Hi,
>
> I recently installed Ubuntu Lucid after using Kubuntu Hardy LTS for a
> long while (KDE 3.5.10).
>
> I am trying to disable sound output to my internal speaker.
>
> I have an HP DX2300 Mini Tower machine which has a full speaker on
> board. There isn't a way to disable it in the BIOS without disabling the
> entire on-board audio device, which I use.
>
> In Hardy I found a way to tick all output devices in Kmix and then dable
> the internal speaker.
>
> I can't find the same in the Gnome Sound Preferences. When I turn off
> the external speakers connected to the line out (green) plug of the
> on-board card, the internal speaker continues to output sound, actually
> it does all the time, but the external speakers mask it while on....
>
> This is really annoying. I am no stranger to the CLI, but I am not sure
> which .conf to change and where to look - I don't know PulseAudio that
> well. I tried to use alsamixer under CLI, but when I turned off all
> volume to PCM, the master volume was also affected....

Hardware fix: unplug the speaker.

Bill