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[Nathan Dorfman <na@xxxxxxxx>]

I'm having the same problem in Ubuntu 14.04.1 LTS using on-board Intel
graphics, no binary drivers in sight.

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https://bugs.launchpad.net/bugs/1001842

Title:
  No Audio from HDMI After Switching Monitor Off / On

Status in fglrx-installer package in Ubuntu:
  Confirmed

Bug description:
  After the 12.04 Update my HDMI audio stops working anytime I turn off or on,  my 2nd monitor(plasma TV)
  System Settings>Sound - Output
  HDMI audio disappears from the list when monitor is turned off or on and does not reappear.

  see http://askubuntu.com/questions/133575/hdmi-audio-stops-after-tv-
  turned-off/139265#139265

  I'm guessing it has something to do with sink detection and ATI video

  The only info I've found is after running pactl list
  Partial copy

  Sink #0
      State: SUSPENDED
      Name: alsa_output.pci-0000_01_00.1.hdmi-stereo
      Description: Turks HDMI Audio [Radeon HD 6000 Series] Digital Stereo (HDMI)
      Driver: module-alsa-card.c
      Sample Specification: s16le 2ch 44100Hz
      Channel Map: front-left,front-right
      Owner Module: 4
      Mute: no
      Volume: 0: 100% 1: 100%
              0: 0.00 dB 1: 0.00 dB
              balance 0.00
      Base Volume: 100%
                   0.00 dB
      Monitor Source: alsa_output.pci-0000_01_00.1.hdmi-stereo.monitor
      Latency: 0 usec, configured 0 usec
      Flags: HARDWARE DECIBEL_VOLUME LATENCY SET_FORMATS 
      Properties:
          alsa.resolution_bits = "16"
          device.api = "alsa"
          device.class = "sound"
          alsa.class = "generic"
          alsa.subclass = "generic-mix"
          alsa.name = "HDMI 0"
          alsa.id = "HDMI 0"
          alsa.subdevice = "0"
          alsa.subdevice_name = "subdevice #0"
          alsa.device = "3"
          alsa.card = "1"
          alsa.card_name = "HD-Audio Generic"
          alsa.long_card_name = "HD-Audio Generic at 0xfddfc000 irq 48"
          alsa.driver_name = "snd_hda_intel"
          device.bus_path = "pci-0000:01:00.1"
          sysfs.path = "/devices/pci0000:00/0000:00:02.0/0000:01:00.1/sound/card1"
          device.bus = "pci"
          device.vendor.id = "1002"
          device.vendor.name = "Advanced Micro Devices [AMD] nee ATI"
          device.product.name = "Turks HDMI Audio [Radeon HD 6000 Series]"
          device.string = "hdmi:1"
          device.buffering.buffer_size = "65536"
          device.buffering.fragment_size = "32768"
          device.access_mode = "mmap+timer"
          device.profile.name = "hdmi-stereo"
          device.profile.description = "Digital Stereo (HDMI)"
          device.description = "Turks HDMI Audio [Radeon HD 6000 Series] Digital Stereo (HDMI)"
          alsa.mixer_name = "ATI R6xx HDMI"
          alsa.components = "HDA:1002aa01,00aa0100,00100200"
          module-udev-detect.discovered = "1"
          device.icon_name = "audio-card-pci"
      Ports:
          hdmi-output-0: HDMI / DisplayPort (priority: 5900, not available)
      Active Port: hdmi-output-0
      Formats:
          pcm

  
  I checked before and after. The only difference is
  hdmi-output-0: HDMI / DisplayPort (priority: 5900, not available)

  Where "not available" is the only change I found.
  Removing cable from HDMI socket and plugging in again, restores audio.
  Logging in and out again restores audio.

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