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The UCM device must be activated using the pa_alsa_ucm_set_port() call on boot (the sink creation time). In case when the mixer controls are not defined for the application in the UCM configuration, the mixer_handle is NULL. Call the pa_alsa_ucm_set_port() before the mixer_handle check. Signed-off-by: Jaroslav Kysela <perex@perex.cz>
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