UCM devices may have a jack control associated with them. There should be a warning if the configured jack control doesn't exist. Note that if no jack control has been explicitly configured, PulseAudio may still try to implicitly use a jack control based on the device name, and in this case, there should be no warning if the implicit jack control isn't found.
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This bug has been migrated to freedesktop.org's GitLab instance and has been closed from further activity.
You can subscribe and participate further through the new bug through this link to our GitLab instance: https://gitlab.freedesktop.org/pulseaudio/pulseaudio/issues/399.