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/usr/share/alsa/ucm/DB410c/HDMI is in libasound2-data 1.1.3-5.

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The actual contents of the file can be viewed below.

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# Use case configuration for DB410c board.
# Author: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>

SectionVerb {
	EnableSequence [
	]

	DisableSequence [
	]
	Value {
		TQ "HiFi"
		PlaybackPCM "plughw:0,0"
	}
}

SectionDevice."HDMI-stereo" {
	#Name "HDMI-stereo"
	Comment "HDMI Digital Stereo Output"

	EnableSequence [
		cdev "hw:0"
	]

	DisableSequence [
		cdev "hw:0"
	]

	Value {
		PlaybackChannels "2"
	}
}