Same problem. The only hint I've got is after running pactl list
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
It seems turning off monitor disables sink? and does not re-enable when tv is turned on again.
hdmi-output-0: HDMI / DisplayPort (priority: 5900, not available)
"not available" should be "available"
I assume you are using an ATI card with fglrx.
try
aticonfig --acpi-services=off
Not sure it this setting is persistant. If so the command to turn on again is.
aticonfig --acpi-services=on
I doubt this will work. EDIT>(It didn't)
As user53740 posted. Logout/in restores audio.
Switching monitor on or off disables HDMI audio.
If you really don't want to logout you can remove hdmi plug an plugin again and hdmi audio will be restored. Don't do it too often. Only when you are desperate.
There is a thread here ond a dodgey bug report here
EDIT> Another workaround is go to System Settings>Display. Then click apply without changing anything.