Amixer control with Verdin IMX8M-Plus

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Based on the context provided, here are some steps you can take to address the issue of unstable audio volume and the inability to control the volume using amixer on the Verdin iMX8M Plus:

  1. Verify ALSA Configuration:

    • Double-check your asound.conf file to ensure it is correctly configured for your specific audio hardware. The dmix plugin is used for mixing multiple audio streams, but ensure that it is properly set up for your use case.

  2. Audio Card Recognition:

    • The empty outputs from amixer suggest that the sound card might not be properly recognized. Ensure that the ALSA_CARD environment variable is correctly set to the appropriate audio card. You might need to verify the actual card name or number using aplay -l to list all sound cards and devices.

  3. Driver Compatibility:

    • Check if the necessary audio drivers are installed and loaded correctly for the Verdin iMX8M Plus. There might be a compatibility issue with the drivers that could affect volume control.

  4. Test Outside Container:

    • Try running the audio playback and volume control commands outside of the Docker container to see if the issue persists. This can help determine if the problem is related to the container environment.

  5. Alternative Audio Management Tools:

    • Consider using other audio management tools or libraries that might offer better control over audio playback and volume stabilization. For example, PulseAudio or PipeWire might provide more robust solutions for managing audio in a containerized environment.

  6. Hardware and Software Updates:

    • Ensure that your system is up to date with the latest firmware and software updates from Toradex, as these might include fixes or improvements for audio handling on the Verdin iMX8M Plus.

By following these steps, you should be able to better diagnose and potentially resolve the issue with unstable audio volume and lack of volume control.

Please, also check if these links can help you solve your problem:

TI AM62 Computer on Module - Verdin AM62.