Comment 2 for bug 1482411

There is no hardware volume control when you use ac3 pass through SPDIF
the volume is controlled by your AC3 digital receiver

index: 2
 name: <alsa_output.pci-0000_00_14.2.iec958-ac3-surround-51>
 driver: <module-alsa-card.c>
 flags: HARDWARE DECIBEL_VOLUME LATENCY
 state: RUNNING
 suspend cause:
 priority: 9958
 volume: front-left: 65536 / 100% / 0,00 dB, front-right: 65536 / 100% / 0,00 dB, rear-left: 65536 / 100% / 0,00 dB, rear-right: 65536 / 100% / 0,00 dB, front-center: 65536 / 100% / 0,00 dB, lfe: 65536 / 100% / 0,00 dB
         balance 0,00
 base volume: 65536 / 100% / 0,00 dB
 volume steps: 65537
 muted: no
 current latency: 96,00 ms
 max request: 54 KiB
 max rewind: 0 KiB
 monitor source: 4
 sample spec: s16le 6ch 48000Hz
 channel map: front-left,front-right,rear-left,rear-right,front-center,lfe
              Surround 5.1
 used by: 1
 linked by: 1
 fixed latency: 96,00 ms
 card: 2 <alsa_card.pci-0000_00_14.2>
 module: 8
 properties:
  alsa.resolution_bits = "16"
  device.api = "alsa"
  device.class = "sound"
  alsa.class = "generic"
  alsa.subclass = "generic-mix"
  alsa.name = ""
  alsa.id = ""
  alsa.subdevice = "0"
  alsa.subdevice_name = ""
  alsa.device = "0"
  device.string = "a52:0"
  device.buffering.buffer_size = "55296"
  device.buffering.fragment_size = "18432"
  device.access_mode = "mmap"
  device.profile.name = "iec958-ac3-surround-51"
  device.profile.description = "Surround numérique 5.1 (IEC958/AC3)"
  device.description = "Audio interne Surround numérique 5.1 (IEC958/AC3)"
  alsa.card = "0"
  alsa.card_name = "HDA ATI SB"
  alsa.long_card_name = "HDA ATI SB at 0xf9ff4000 irq 16"
  alsa.driver_name = "snd_hda_intel"
  device.bus_path = "pci-0000:00:14.2"
  sysfs.path = "/devices/pci0000:00/0000:00:14.2/sound/card0"
  device.bus = "pci"
  device.vendor.id = "1002"
  device.vendor.name = "Advanced Micro Devices, Inc. [AMD/ATI]"
  device.product.id = "4383"
  device.product.name = "SBx00 Azalia (Intel HDA)"
  device.form_factor = "internal"
  module-udev-detect.discovered = "1"
  device.icon_name = "audio-card-pci"
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