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I always have my master channel muted, and I switched the volume applet to adjust the headphone channel. This way, sound never comes out of my speakers, but it's always on when I plug headphones in.

However, when I use my Fn keys to adjust volume, they adjust the "master" channel, rather than the "headphone" channel. How do I change this behavior? If it makes a difference, I am using a Dell Inspiron 1200.

Related question for solving this problem in Karmic

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Related question for solving this problem in Karmic: superuser.com/questions/51842 – Matthew Oct 20 '09 at 16:56
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This is specified by the System > Preferences > Sound menu option. Select the channel you want to control under the Default Mixer Tracks section.

Sound Preferences

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This worked. To get any options another than "Master" in the list, I had to switch "Device" from the PulseAudio mixer to the Alsa Mixer. Does this mean that I am no longer using PulseAudio? Any side-effects I should know about? – Matthew Aug 26 '09 at 13:58
I have an Apple keyboard, which also have similar keys, but i guess are having some different codes. How can I get the actual codes from my new keyboard, and how do I map those into the mixer ? – jfmessier Oct 20 '09 at 18:09
@jfmessier: Check answer from mas to this question superuser.com/questions/2194/remap-keys-in-linux – nagul Oct 20 '09 at 20:55
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