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/usr/share/alsa/ucm/skylake-rt286/skylake-rt286.conf 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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# UCM for Intel SKYLAKE/KABYLAKE platforms
# For Audio in I2S mode

SectionUseCase."HiFi" {
	File "HiFi"
	Comment "Play and record HiFi quality Music"
}

SectionUseCase."Hdmi1" {
        File "Hdmi1"
        Comment "Play on Hdmi/DP 1"
}

SectionUseCase."Hdmi2" {
        File "Hdmi2"
        Comment "Play on Hdmi/DP 2"
}

ValueDefaults {
	PlaybackCTL "hw:skylakert286"
	CaptureCTL "hw:skylakert286"
	CaptureChannels "2"
	CapturePriority "2"	
}

SectionDefaults [
	cdev "hw:skylakert286"
	cset "name='Headphone Jack Switch' 1"
	cset "name='Speaker Switch' 1"
	cset "name='Speaker Playback Switch' 0,0"
	cset "name='Front DAC Switch' 1"
	cset "name='Front RECMIX Switch' 0"
	cset "name='Mic Jack Switch' 1"
	cset "name='ADC 0 Mux' 2"
	cset "name='ADC 1 Mux' 0"
	cset "name='ADC0 Capture Volume' 105,105"
	cset "name='ADC0 Capture Switch' 1,1"
	cset "name='AMIC Volume' 3"
	cset "name='DAC0 Playback Volume' 100,100"
	cset "name='HPO L Switch' 0"
	cset "name='HPO Mux' 0"
	cset "name='HPO R Switch' 0"
	cset "name='Pin 5 Mux' 1"
	cset "name='Pin 6 Mux' 2"
	cset "name='Pin 7 Mux' 3"
	cset "name='RECMIX Beep Switch' 0"
	cset "name='RECMIX Line1 Switch' 0"
	cset "name='RECMIX Mic1 Switch' 0"
	cset "name='SPK Mux' 0"
	cset "name='SPO Switch' 1"
	cset "name='codec0_out mo codec0_in mi Switch' 0"
	cset "name='codec0_out mo dmic01_hifi_in mi Switch' 0"
	cset "name='codec0_out mo media0_in mi Switch' 1"
	cset "name='codec1_out mo codec0_in mi Switch' 0"
	cset "name='codec1_out mo dmic01_hifi_in mi Switch' 0"
	cset "name='codec1_out mo media0_in mi Switch' 0"
	cset "name='media0_out mo codec0_in mi Switch' 1"
	cset "name='media0_out mo dmic01_hifi_in mi Switch' 1"
	cset "name='media0_out mo media0_in mi Switch' 0"
]