ALC4082: capturing S/PDIF output causes volume to jump to max - asus rog crosshair x670e hero

6 Aug 2025


      alsa-project/alsa-ucm-conf issue #598 was edited from LuanVSO:
hi, i had a problem where opening the kde plasma volume applet would make the volume on my headphone jump to the maximum.
after muting the "PCM 2" channel on alsamixer i notice that the volume on the headphone would go muted instead.
so i edited the ALC4080-HiFi.conf file and remove every mention of S/PDIF and rebooted my machine.
after the change the problem didn't happen anymore.
what do you need to fix the mapping problem?
i think this happens because the "PCM 2" volume controls is redirecting to headphone output, but it doenst have a slider, so it is either max or muted:
<img width="1259" height="967" alt="Image" src="https://github.com/user-attachments/assets/3b266bb7-7e1c-4a7a-b448-affabf06b01c" />
(also the S/PDIF aways appeared as connected even though i did not have anything connected to it, don't know if it is expected)
[alsa-info.txt](https://github.com/user-attachments/files/21583734/alsa-info.txt)
<details>
<summary>edited ALC4080-HiFi.conf</summary>
```
Define {
    SpeakerMixer "PCM"
    SpeakerMindex "0"
    SpeakerJack "Speaker - Output Jack"
    SpeakerPCM "hw:${CardId}"
HeadphonesName "Front Headphones"
    HeadphonesMixer "PCM"
    HeadphonesMindex "1"
    HeadphonesJack "Headphone - Output Jack"
    HeadphonesPCM "hw:${CardId},1"
Mic1Name "Microphone"
    Mic1Mixer "Mic"
    Mic1Mindex "0"
    Mic1Jack "Mic - Input Jack"
    Mic1PCM "hw:${CardId},2"
Mic2Name ""
    Mic2Mixer ""
    Mic2Mindex "0"
    Mic2Jack ""
    Mic2PCM ""
Line1Name "Line Input"
    Line1Mixer "Line"
    Line1Mindex "0"
    Line1Jack "Line - Input Jack"
    Line1PCM "hw:${CardId},1"
#	SpdifName "S/PDIF Output"
#	SpdifPCM "hw:${CardId},3"
#	SpdifMixer "PCM"
#	SpdifMindex "2"
}
If.speaker_ctl {
    Condition {
    	Type ControlExists
    	Control "name='Speaker Playback Switch'"
    }
    True.Define.SpeakerMixer "Speaker"
}
If.front_hp_ctl {
    Condition {
    	Type ControlExists
    	Control "name='Front Headphone Playback Switch'"
    }
    True.Define {
    	HeadphonesMixer "Front Headphone"
    	HeadphonesMindex "0"
    }
}
#If.spdif_ctl {
#	Condition {
#		Type ControlExists
#		Control "name='IEC958 Playback Switch'"
#	}
#	True.Define {
#		SpdifMixer "IEC958"
#		SpdifMindex "0"
#	}
#}
#If.spdif_nodev {
#	Condition {
#		Type RegexMatch
#		String "${CardComponents}"
#		Regex "USB(0db0:36e7)"
#	}
#	True.Define.SpdifName ""
#}
#If.spdif_dev2 {
#	Condition {
#		Type RegexMatch
#		String "${CardComponents}"
#		Regex "USB(0b05:(1996|1a5[23c])|0db0:1feb)"
#	}
#	True.Define.SpdifPCM "hw:${CardId},2"
#}
If.gigabyte-aorus-ultra {
    Condition {
    	Type RegexMatch
    	String "${CardComponents}"
    	Regex "USB(0414:a014)"
    }
    True.Define {
    	Mic1Name "Front Microphone"
    	Mic1PCM "hw:${CardId},0"
    	Mic2Name "Rear Microphone"
    	Mic2Mixer "Mic"
    	Mic2Mindex "1"
    	Mic2Jack "name='Mic - Input Jack',index=1"
    	Mic2PCM "hw:${CardId},1"
    	SpdifName ""
    	Line1Name ""
    }
}
If.asus-rog-usb {
    Condition {
    	Type RegexMatch
    	String "${CardComponents}"
    	Regex "USB(0b05:1996)"
    }
    True.Define {
    	Mic1Name "Front Microphone"
    	Mic2Name "Microphone"
    	Mic2Mixer "Analog In"
    	Mic2Jack "Analog In - Input Jack"
    	Mic2PCM "hw:${CardId}"
    }
}
If.asrock-taichi {
    Condition {
    	Type RegexMatch
    	String "${CardComponents}"
    	Regex "USB(26ce:0a0[68b])"
    }
    True.Define {
    	Line1Name ""
    	Mic1Name "Rear Input"
    	Mic1PCM "hw:${CardId},0"
    	Mic2Name "Front Microphone"
    	Mic2Mixer "Mic"
    	Mic2Jack "Front Mic - Input Jack"
    	Mic2PCM "hw:${CardId},1"
    }
}
If.wrx80-sage {
    Condition {
    	Type RegexMatch
    	String "${CardComponents}"
    	Regex "USB(0b05:1984)"
    }
    True.Define {
    	Mic2Name "Front Microphone"
    	Mic2Mixer "Analog In"
    	Mic2Jack "Analog In - Input Jack"
    	Mic2PCM "hw:${CardId}"
    }
}
If.msi-meg-unify {
    Condition {
    	Type RegexMatch
    	String "${CardComponents}"
    	Regex "USB(0db0:82c7)"
    }
    True.Define {
    	HeadphonesName ""
    	SpdifName ""
    }
}
If.asus-rog-strix {
    Condition {
    	Type RegexMatch
    	String "${CardComponents}"
    	Regex "USB(0b05:1999)"
    }
    True.Define {
    	Line1PCM "hw:${CardId},3"
    	HeadphonesName ""
    	SpdifName ""
    }
}
SectionVerb {
    EnableSequence [
    	disdevall ""
    ]
Value.TQ "HiFi"
}
SectionDevice."Speaker" {
    Comment "Speakers"
EnableSequence [
    	cset "name='${var:SpeakerMixer} Playback Switch',index=${var:SpeakerMindex} on"
    ]
DisableSequence [
    	cset "name='${var:SpeakerMixer} Playback Switch',index=${var:SpeakerMindex} off"
    ]
Value {
    	PlaybackChannels 2
    	PlaybackPriority 200
    	PlaybackPCM "${var:SpeakerPCM}"
    	JackControl "${var:SpeakerJack}"
    	PlaybackMixerElem "${var:SpeakerMixer},${var:SpeakerMindex}"
    }
Variant."HiFi 5+1".Value.PlaybackChannels 6
    Variant."HiFi 7+1".Value.PlaybackChannels 8
}
If.headphones {
    Condition {
    	Type String
    	Empty "${var:HeadphonesName}"
    }
    False.SectionDevice."Headphones" {
    	Comment "${var:HeadphonesName}"
EnableSequence [
    		cset "name='${var:HeadphonesMixer} Playback Switch',index=${var:HeadphonesMindex} on"
    	]
DisableSequence [
    		cset "name='${var:HeadphonesMixer} Playback Switch',index=${var:HeadphonesMindex} off"
    	]
Value {
    		PlaybackPriority 300
    		PlaybackPCM "${var:HeadphonesPCM}"
    		JackControl "${var:HeadphonesJack}"
    		PlaybackMixerElem "${var:HeadphonesMixer},${var:HeadphonesMindex}"
    	}
    }
}
#If.spdif {
#	Condition {
#		Type String
#		Empty "${var:SpdifName}"
#	}
#	False.SectionDevice."SPDIF" {
#		Comment "${var:SpdifName}"
#
#		EnableSequence [
#			cset "name='${var:SpdifMixer} Playback Switch',index=${var:SpdifMindex} on"
#		]
#
#		DisableSequence [
#			cset "name='${var:SpdifMixer} Playback Switch',index=${var:SpdifMindex} off"
#		]
#
#		Value {
#			PlaybackPriority 100
#			PlaybackPCM "${var:SpdifPCM}"
#			PlaybackMixerElem "${var:SpdifMixer},${var:SpdifMindex}"
#		}
#	}
#}
If.line1 {
    Condition {
    	Type String
    	Empty "${var:Line1Name}"
    }
    False.SectionDevice."Line1" {
    	Comment "${var:Line1Name}"
EnableSequence [
    		cset "name='${var:Line1Mixer} Capture Switch',index=${var:Line1Mindex} on"
    	]
DisableSequence [
    		cset "name='${var:Line1Mixer} Capture Switch',index=${var:Line1Mindex} off"
    	]
Value {
    		CapturePriority 100
    		CapturePCM "${var:Line1PCM}"
    		JackControl "${var:Line1Jack}"
    		CaptureMixerElem "${var:Line1Mixer},${var:Line1Mindex}"
    	}
    }
}
If.mic1 {
    Condition {
    	Type String
    	Empty "${var:Mic1Name}"
    }
    False.SectionDevice."Mic1" {
    	Comment "${var:Mic1Name}"
EnableSequence [
    		cset "name='${var:Mic1Mixer} Capture Switch',index=${var:Mic1Mindex} on"
    	]
DisableSequence [
    		cset "name='${var:Mic1Mixer} Capture Switch',index=${var:Mic1Mindex} off"
    	]
Value {
    		CapturePriority 300
    		CapturePCM "${var:Mic1PCM}"
    		JackControl "${var:Mic1Jack}"
    		CaptureMixerElem "${var:Mic1Mixer},${var:Mic1Mindex}"
    	}
    }
}
If.mic2 {
    Condition {
    	Type String
    	Empty "${var:Mic2Name}"
    }
    False.SectionDevice."Mic2" {
    	Comment "${var:Mic2Name}"
EnableSequence [
    		cset "name='${var:Mic2Mixer} Capture Switch',index=${var:Mic2Mindex} on"
    	]
DisableSequence [
    		cset "name='${var:Mic2Mixer} Capture Switch',index=${var:Mic2Mindex} off"
    	]
Value {
    		CapturePriority 400
    		CapturePCM "${var:Mic2PCM}"
    		JackControl "${var:Mic2Jack}"
    		CaptureMixerElem "${var:Mic2Mixer},${var:Mic2Mindex}"
    	}
    }
}
```
</details>
Issue URL     : https://github.com/alsa-project/alsa-ucm-conf/issues/598
Repository URL: https://github.com/alsa-project/alsa-ucm-conf

ALC4082: capturing S/PDIF output causes volume to jump to max - asus rog crosshair x670e hero

GitHub issues - edited