This file is indexed.

/usr/share/alsa/ucm/skylake-rt286/Hdmi2 is in libasound2-data 1.1.3-5.

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# Usecase for device HDMI2/Display Port stereo playback on Intel SKYLAKE/KABYLAKE platforms
# For Audio in I2S mode

SectionDevice."Hdmi2" {
        Comment "HDMI/Display Port 2 Stereo"

        EnableSequence [
        ]

        DisableSequence [
        ]

        Value {
                PlaybackPCM "hw:skylakert286,5"
                PlaybackChannels "2"
                PlaybackPriority "4"
                JackControl "HDMI/DP, pcm=5 Jack"
        }
}