control.39 {
                iface CARD
                name 'Line Out Front Jack'
                value false
                comment {
                        access read
                        type BOOLEAN
                        count 1
                }
        }
        control.40 {
                iface CARD
                name 'Line Out Surround Jack'
                value false
                comment {
                        access read
                        type BOOLEAN
                        count 1
                }
        }
        control.41 {
                iface CARD
                name 'Line Out CLFE Jack'
                value false
                comment {
                        access read
                        type BOOLEAN
                        count 1
                }
        }
        control.42 {
                iface CARD
                name 'Line Out Side Jack'
                value false
                comment {
                        access read
                        type BOOLEAN
                        count 1
                }
        }
        control.43 {
                iface CARD
                name 'Front Headphone Jack'
                value false
                comment {
                        access read
                        type BOOLEAN
                        count 1
                }
        }


do you mean that you are using spdif output since all analog output jacks are 
unplugged ?

control.39 {
                iface CARD
                name 'Line Out Front Jack'
                value false
                comment {
                        access read
                        type BOOLEAN
                        count 1
                }
        }
        control.40 {
                iface CARD
                name 'Line Out Surround Jack'
                value false
                comment {
                        access read
                        type BOOLEAN
                        count 1
                }
        }
        control.41 {
                iface CARD
                name 'Line Out CLFE Jack'
                value false
                comment {
                        access read
                        type BOOLEAN
                        count 1
                }
        }
        control.42 {
                iface CARD
                name 'Line Out Side Jack'
                value false
                comment {
                        access read
                        type BOOLEAN
                        count 1
                }
        }
        control.43 {
                iface CARD
                name 'Front Headphone Jack'
                value false
                comment {
                        access read
                        type BOOLEAN
                        count 1
                }
        }

Default sink name: alsa_output.pci-0000_00_1b.0.iec958-stereo
Default source name: alsa_input.pci-0000_00_1b.0.analog-stereo

but you have turn on IEC958 Default PCM which driver copy audio to both analog 
and digital
and digital spdif won't work 


Simple mixer control 'IEC958 Default PCM',0
  Capabilities: pswitch pswitch-joined
  Playback channels: Mono
  Mono: Playback [on]

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https://bugs.launchpad.net/bugs/1458136

Title:
  [MS-7823, Realtek ALC892, Green SPDIF Out, Rear] No sound at all
  snd_hda_intel Cannot turn on display power on i915

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