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I have two different audio output devices: an internal sound card and an external DAC/amp.

When starting an OpenAL application (I first observed the issue with Minecraft, but I suspect it affects all applications that use OpenAL for audio playback), the internal sound card is selected for output, and I cannot change the device using pavucontrol (or KMixer on Kubuntu). The option to select an alternate device is present, but choosing the device has no effect.

How can I select an alternate audio playback device for OpenAL applications?

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The solution is to add the option allow-moves = true to the OpenAL configuration file (the per-user file is located at ~/.alsoftrc).

If you don't already have this file (it doesn't exist by default), you can copy it from /etc/openal/alsoft.conf or use this sample default configuration.

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