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I can't get my IEC958 output working. The optical wire is physically connected to a powered 192KHz DAC via my sound card:

ツ sudo lspci |grep -i audio 00:1b.0 Audio device: Intel Corporation 7 Series/C216 Chipset Family High Definition Audio Controller (rev 04)

I have several devices detected:

devices

When I select the first, "HDMI / DisplayPort 2 - Built-in Audio", sound comes out of the speaker integral to my monitor.

When I select the second, "Line Out - Built-in Audio" sound comes out of the headphone jack I have connected directly to the sound card.

I know for a fact that the DAC works because I was using it with Archlinux as recently as two days ago and nothing has changed in the physical setup.

Everything appears to be set up correctly in pavucontrol:

Configuration. Again, if I select HDMI or Line Out, I get sound. Just not with S/PDIF: config Input device includes a monitor (is that correct??) input Output device shows bouncing bar on the vumeter: output

The sound card is integral to my motherboard. Some more diagnostic info:

ツ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 1: PCH [HDA Intel PCH], device 0: ALC892 Analog [ALC892 Analog]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: PCH [HDA Intel PCH], device 1: ALC892 Digital [ALC892 Digital]
  Subdevices: 0/1
  Subdevice #0: subdevice #0
card 1: PCH [HDA Intel PCH], device 3: HDMI 0 [HDMI 0]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: PCH [HDA Intel PCH], device 7: HDMI 1 [HDMI 1]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
ツ pacmd list-cards
1 card(s) available.
    index: 0
    name: 
    driver: 
    owner module: 7
    properties:
        alsa.card = "1"
        alsa.card_name = "HDA Intel PCH"
        alsa.long_card_name = "HDA Intel PCH at 0xf7d30000 irq 46"
        alsa.driver_name = "snd_hda_intel"
        device.bus_path = "pci-0000:00:1b.0"
        sysfs.path = "/devices/pci0000:00/0000:00:1b.0/sound/card1"
        device.bus = "pci"
        device.vendor.id = "8086"
        device.vendor.name = "Intel Corporation"
        device.product.id = "1e20"
        device.product.name = "7 Series/C216 Chipset Family High Definition Audio Controller"
        device.form_factor = "internal"
        device.string = "1"
        device.description = "Built-in Audio"
        module-udev-detect.discovered = "1"
        device.icon_name = "audio-card-pci"
    profiles:
        input:analog-stereo: Analog Stereo Input (priority 65, available: no)
        output:analog-stereo: Analog Stereo Output (priority 6500, available: unknown)
        output:analog-stereo+input:analog-stereo: Analog Stereo Duplex (priority 6565, available: unknown)
        output:analog-surround-21: Analog Surround 2.1 Output (priority 1300, available: unknown)
        output:analog-surround-21+input:analog-stereo: Analog Surround 2.1 Output + Analog Stereo Input (priority 1365, available: unknown)
        output:analog-surround-40: Analog Surround 4.0 Output (priority 1200, available: unknown)
        output:analog-surround-40+input:analog-stereo: Analog Surround 4.0 Output + Analog Stereo Input (priority 1265, available: unknown)
        output:analog-surround-41: Analog Surround 4.1 Output (priority 1300, available: unknown)
        output:analog-surround-41+input:analog-stereo: Analog Surround 4.1 Output + Analog Stereo Input (priority 1365, available: unknown)
        output:analog-surround-50: Analog Surround 5.0 Output (priority 1200, available: unknown)
        output:analog-surround-50+input:analog-stereo: Analog Surround 5.0 Output + Analog Stereo Input (priority 1265, available: unknown)
        output:analog-surround-51: Analog Surround 5.1 Output (priority 1300, available: unknown)
        output:analog-surround-51+input:analog-stereo: Analog Surround 5.1 Output + Analog Stereo Input (priority 1365, available: unknown)
        output:analog-surround-71: Analog Surround 7.1 Output (priority 1200, available: unknown)
        output:analog-surround-71+input:analog-stereo: Analog Surround 7.1 Output + Analog Stereo Input (priority 1265, available: unknown)
        output:iec958-stereo: Digital Stereo (IEC958) Output (priority 5500, available: unknown)
        output:iec958-stereo+input:analog-stereo: Digital Stereo (IEC958) Output + Analog Stereo Input (priority 5565, available: unknown)
        output:hdmi-stereo: Digital Stereo (HDMI) Output (priority 5900, available: no)
        output:hdmi-stereo+input:analog-stereo: Digital Stereo (HDMI) Output + Analog Stereo Input (priority 5965, available: no)
        output:hdmi-surround: Digital Surround 5.1 (HDMI) Output (priority 800, available: no)
        output:hdmi-surround+input:analog-stereo: Digital Surround 5.1 (HDMI) Output + Analog Stereo Input (priority 865, available: no)
        output:hdmi-surround71: Digital Surround 7.1 (HDMI) Output (priority 800, available: no)
        output:hdmi-surround71+input:analog-stereo: Digital Surround 7.1 (HDMI) Output + Analog Stereo Input (priority 865, available: no)
        output:hdmi-stereo-extra1: Digital Stereo (HDMI 2) Output (priority 5700, available: unknown)
        output:hdmi-stereo-extra1+input:analog-stereo: Digital Stereo (HDMI 2) Output + Analog Stereo Input (priority 5765, available: unknown)
        off: Off (priority 0, available: unknown)
    active profile: 
    sinks:
        alsa_output.pci-0000_00_1b.0.iec958-stereo/#59: Built-in Audio Digital Stereo (IEC958)
    sources:
        alsa_output.pci-0000_00_1b.0.iec958-stereo.monitor/#59: Monitor of Built-in Audio Digital Stereo (IEC958)
    ports:
        analog-input-front-mic: Front Microphone (priority 8500, latency offset 0 usec, available: no)
            properties:
                device.icon_name = "audio-input-microphone"
        analog-input-rear-mic: Rear Microphone (priority 8200, latency offset 0 usec, available: no)
            properties:
                device.icon_name = "audio-input-microphone"
        analog-input-linein: Line In (priority 8100, latency offset 0 usec, available: no)
            properties:

        analog-output-lineout: Line Out (priority 9900, latency offset 0 usec, available: yes)
            properties:

        analog-output-headphones: Headphones (priority 9000, latency offset 0 usec, available: no)
            properties:
                device.icon_name = "audio-headphones"
        iec958-stereo-output: Digital Output (S/PDIF) (priority 0, latency offset 0 usec, available: unknown)
            properties:

        hdmi-output-0: HDMI / DisplayPort (priority 5900, latency offset 0 usec, available: no)
            properties:
                device.icon_name = "video-display"
        hdmi-output-1: HDMI / DisplayPort 2 (priority 5800, latency offset 0 usec, available: yes)
            properties:
                device.icon_name = "video-display"
                device.product.name = "VX2770 SERIES"
ツ pacmd list-sinks
1 sink(s) available.
  * index: 59
    name: 
    driver: 
    flags: HARDWARE HW_MUTE_CTRL DECIBEL_VOLUME LATENCY DYNAMIC_LATENCY
    state: RUNNING
    suspend cause: (none)
    priority: 9038
    volume: front-left: 65536 / 100% / 0.00 dB,   front-right: 65536 / 100% / 0.00 dB
            balance 0.00
    base volume: 65536 / 100% / 0.00 dB
    volume steps: 65537
    muted: no
    current latency: 7.67 ms
    max request: 1 KiB
    max rewind: 1 KiB
    monitor source: 59
    sample spec: s16le 2ch 44100Hz
    channel map: front-left,front-right
                 Stereo
    used by: 3
    linked by: 3
    configured latency: 8.00 ms; range is 8.00 .. 371.52 ms
    card: 0 
    module: 7
    properties:
        alsa.resolution_bits = "16"
        device.api = "alsa"
        device.class = "sound"
        alsa.class = "generic"
        alsa.subclass = "generic-mix"
        alsa.name = "ALC892 Digital"
        alsa.id = "ALC892 Digital"
        alsa.subdevice = "0"
        alsa.subdevice_name = "subdevice #0"
        alsa.device = "1"
        alsa.card = "1"
        alsa.card_name = "HDA Intel PCH"
        alsa.long_card_name = "HDA Intel PCH at 0xf7d30000 irq 46"
        alsa.driver_name = "snd_hda_intel"
        device.bus_path = "pci-0000:00:1b.0"
        sysfs.path = "/devices/pci0000:00/0000:00:1b.0/sound/card1"
        device.bus = "pci"
        device.vendor.id = "8086"
        device.vendor.name = "Intel Corporation"
        device.product.id = "1e20"
        device.product.name = "7 Series/C216 Chipset Family High Definition Audio Controller"
        device.form_factor = "internal"
        device.string = "iec958:1"
        device.buffering.buffer_size = "65536"
        device.buffering.fragment_size = "32768"
        device.access_mode = "mmap+timer"
        device.profile.name = "iec958-stereo"
        device.profile.description = "Digital Stereo (IEC958)"
        device.description = "Built-in Audio Digital Stereo (IEC958)"
        alsa.mixer_name = "Realtek ALC892"
        alsa.components = "HDA:10ec0892,104384fb,00100302 HDA:80862806,80860101,00100000"
        module-udev-detect.discovered = "1"
        device.icon_name = "audio-card-pci"
    ports:
        iec958-stereo-output: Digital Output (S/PDIF) (priority 0, latency offset 0 usec, available: unknown)
            properties:

    active port: 
ツ cat /etc/modprobe.d/alsa-base.conf     
# autoloader aliases
install sound-slot-0 /sbin/modprobe snd-card-0
install sound-slot-1 /sbin/modprobe snd-card-1
install sound-slot-2 /sbin/modprobe snd-card-2
install sound-slot-3 /sbin/modprobe snd-card-3
install sound-slot-4 /sbin/modprobe snd-card-4
install sound-slot-5 /sbin/modprobe snd-card-5
install sound-slot-6 /sbin/modprobe snd-card-6
install sound-slot-7 /sbin/modprobe snd-card-7

# Cause optional modules to be loaded above generic modules
install snd /sbin/modprobe --ignore-install snd $CMDLINE_OPTS && { /sbin/modprobe --quiet --use-blacklist snd-ioctl32 ; /sbin/modprobe --quiet --use-blacklist snd-seq ; }
#
# Workaround at bug #499695 (reverted in Ubuntu see LP #319505)
install snd-pcm /sbin/modprobe --ignore-install snd-pcm $CMDLINE_OPTS && { /sbin/modprobe --quiet --use-blacklist snd-pcm-oss ; : ; }
install snd-mixer /sbin/modprobe --ignore-install snd-mixer $CMDLINE_OPTS && { /sbin/modprobe --quiet --use-blacklist snd-mixer-oss ; : ; }
install snd-seq /sbin/modprobe --ignore-install snd-seq $CMDLINE_OPTS && { /sbin/modprobe --quiet --use-blacklist snd-seq-midi ; /sbin/modprobe --quiet --use-blacklist snd-seq-oss ; : ; }
#
install snd-rawmidi /sbin/modprobe --ignore-install snd-rawmidi $CMDLINE_OPTS && { /sbin/modprobe --quiet --use-blacklist snd-seq-midi ; : ; }
# Cause optional modules to be loaded above sound card driver modules
install snd-emu10k1 /sbin/modprobe --ignore-install snd-emu10k1 $CMDLINE_OPTS && { /sbin/modprobe --quiet --use-blacklist snd-emu10k1-synth ; }
install snd-via82xx /sbin/modprobe --ignore-install snd-via82xx $CMDLINE_OPTS && { /sbin/modprobe --quiet --use-blacklist snd-seq ; }

# Load saa7134-alsa instead of saa7134 (which gets dragged in by it anyway)
install saa7134 /sbin/modprobe --ignore-install saa7134 $CMDLINE_OPTS && { /sbin/modprobe --quiet --use-blacklist saa7134-alsa ; : ; }
# Prevent abnormal drivers from grabbing index 0
options bt87x index=-2
options cx88_alsa index=-2
options saa7134-alsa index=-2
options snd-atiixp-modem index=-2
options snd-intel8x0m index=-2
options snd-via82xx-modem index=-2
options snd-usb-audio index=-2
options snd-usb-caiaq index=-2
options snd-usb-ua101 index=-2
options snd-usb-us122l index=-2
options snd-usb-usx2y index=-2
# Ubuntu #62691, enable MPU for snd-cmipci
options snd-cmipci mpu_port=0x330 fm_port=0x388
# Keep snd-pcsp from being loaded as first soundcard
options snd-pcsp index=-2
# Keep snd-usb-audio from beeing loaded as first soundcard
options snd-usb-audio index=-2

options snd-hda-intel index=1
ツ iecset audio on
snd_ctl_open: No such file or directory
ツ lsmod|grep snd
snd_hda_codec_hdmi     49152  1
snd_hda_codec_realtek   106496  1
snd_hda_codec_generic    73728  1 snd_hda_codec_realtek
snd_hda_intel          40960  4
snd_hda_codec         126976  4 snd_hda_codec_generic,snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec_realtek
snd_hda_core           81920  5 snd_hda_codec_generic,snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec,snd_hda_codec_realtek
snd_hwdep              20480  1 snd_hda_codec
snd_pcm                98304  5 snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec,snd_hda_core
snd_seq_midi           16384  0
snd_seq_midi_event     16384  1 snd_seq_midi
snd_rawmidi            32768  1 snd_seq_midi
snd_seq                65536  2 snd_seq_midi,snd_seq_midi_event
snd_seq_device         16384  3 snd_seq,snd_seq_midi,snd_rawmidi
snd_timer              32768  2 snd_seq,snd_pcm
snd                    81920  18 snd_hda_codec_generic,snd_seq,snd_seq_device,snd_hda_codec_hdmi,snd_hwdep,snd_hda_intel,snd_hda_codec,snd_hda_codec_realtek,snd_timer,snd_pcm,snd_rawmidi

Note: I have gone through most of the steps here, https://help.ubuntu.com/community/SoundTroubleshootingProcedure, and I have searched extensively, spending several hours on this yesterday. I am befuddled and posting here as a last resort.

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