OpenMoko Neo1973 Desktop Survival Guide by Graham Williams
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Mixer

The basic application to set the volume and change various parameters for audio is the command line alsamixer, which runs in a Terminal (Chapter 16). Figure 13.2 shows the interface.

Figure 13.2: The alsamixer audio controller.

To exit from alsamixer press the ESC key.

The mixer application shows a list of controls, starting with the Headphones volume control. The mixer is actually quite a complex device, with 83 controls. The controls include:

• Headphone
• Headphone Playback ZC
• Bass
• ...
• Amp Left
• ...
• Amp Right
• ...
• Speaker
• Speaker Playback ZC
• Voice

Using saved states allows us to set the controls up appropriately. For example, before making a call, try:

alsactl -f /etc/alsa/gsmhandset.state restore

Then start up alsamixer and adjust the Amp Left and Amp Right controls to suit your needs.

If you have a headset connected, then instead you can set up the headset profile:

alsactl -f /etc/alsa/gsmheadset.state restore

To then put the Neo back into stereo output, use:

alsactl -f /etc/alsa/stereoout.state restore

If you modify the settings through alsamixer you can then save your settings to file with:

alsactl -f /etc/alsa/myprefered.state store

Give the file (here called myprefered.state) any name you like.

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