a weird sound problem appeared after a do-release-upgrade (14.04 -> 16.04): After upgrade, sound output through HDMI/pulseaudio (which used to work just fine before) works erratically: sometimes there's no sound at all even if the pavucontrol panel displays output levels as if everything was ok (if I select/configure HDMI output and play anything with mplayer for instance, it shows the volume level bar bouncing, but no sound from speakers).
sometimes after a reboot, without changing anything to the sound settings, sound is really coming from HDMI output! right now, I can't hear a thing from the HDMI output, but pavucontronl looks like this: pavucontrol screen capture as playing a mp3 file
and here is the output of pacmd list-sinks, as I'm trying to play the same file, no sound actually produced yet...
pacmd list-sinks
1 sink(s) available.
* index: 15
name: <alsa_output.pci-0000_00_03.0.hdmi-stereo>
driver: <module-alsa-card.c>
flags: HARDWARE DECIBEL_VOLUME LATENCY DYNAMIC_LATENCY
state: RUNNING
suspend cause:
priority: 9950
volume: front-left: 62850 / 96% / -1,09 dB, front-right: 62850 / 96% / -1,09 dB
balance 0,00
base volume: 65536 / 100% / 0,00 dB
volume steps: 65537
muted: no
current latency: 178,02 ms
max request: 36 KiB
max rewind: 64 KiB
monitor source: 17
sample spec: s16le 2ch 44100Hz
channel map: front-left,front-right
Stéréo
used by: 1
linked by: 1
configured latency: 210,00 ms; range is 0,50 .. 371,52 ms
card: 0 <alsa_card.pci-0000_00_03.0>
module: 2
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 = "0"
alsa.card_name = "HDA Intel HDMI"
alsa.long_card_name = "HDA Intel HDMI at 0xaa134000 irq 49"
alsa.driver_name = "snd_hda_intel"
device.bus_path = "pci-0000:00:03.0"
sysfs.path = "/devices/pci0000:00/0000:00:03.0/sound/card0"
device.bus = "pci"
device.vendor.id = "8086"
device.vendor.name = "Intel Corporation"
device.product.id = "160c"
device.product.name = "Broadwell-U Audio Controller"
device.form_factor = "internal"
device.string = "hdmi:0"
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 = "Audio interne Digital Stereo (HDMI)"
alsa.mixer_name = "Intel Broadwell HDMI"
alsa.components = "HDA:80862808,80860101,00100000"
module-udev-detect.discovered = "1"
device.icon_name = "audio-card-pci"
ports:
hdmi-output-0: HDMI / DisplayPort (priority 5900, latency offset 0 usec, available: yes)
properties:
device.icon_name = "video-display"
device.product.name = "PLB2403WS"
active port: <hdmi-output-0>
I checked the HDMI cable, tried to use another hdmi source on the same hdmi monitor: definitely not a hardware pb. No such trouble using the analogic output so far.
I read this thread and tried to apply the same recipes (speaker-test using hdmi related devices does not produce any sound, works well with analogic (PCH) device) so it doesn't seem to be a default sampling rate pb.
It rather looks like a lower level hdmi module problem, though snd_hda_codec_hdmi is loaded, and I'm stuck there, trying to guess. Any idea is welcome! :-)
