Hi,
I am a bit confused about a problem I have with the sound output on my antergos box via HDMI:
I have installed kodi and watching HD videos works fine, sound and all. But as soon, as I try to watch a SD video, no sound is available anymore. Also e.g. on Youtube videos in Chrome, no sound is played.
At first I guessed it was some codec issue, but I have by now installed pretty mutch any codec-pack and player I found, without result…

Some info about my soundcard:

$ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: HDMI [HDA Intel HDMI], device 3: HDMI 0 [HDMI 0]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: HDMI [HDA Intel HDMI], device 7: HDMI 1 [HDMI 1]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: HDMI [HDA Intel HDMI], device 8: HDMI 2 [HDMI 2]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
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: 1/1
  Subdevice #0: subdevice #0

/etc/asound.conf (not touched)

$ cat /etc/asound.conf
# Use PulseAudio by default
pcm.!default {
  type pulse
  fallback "sysdefault"
  hint {
    show on
    description "Default ALSA Output (currently PulseAudio Sound Server)"
  }
}

ctl.!default {
  type pulse
  fallback "sysdefault"
}

# vim:set ft=alsaconf:

Trying “aplay -D plughw:X,Y /usr/share/sounds/alsa/Front_Center.wav” doesn’t yield any sound for any card / device combination

In pavucontrol I have only enabled one output device configuration, for the HDMI output. I have tried all the possible configuration values for HDMI (stereo, 7.1, 5.1, the unplugged ones). I can see the volume level on the output device when a playback is running, but i can’t hear any output.

alsamixer:
default:
0_1471792944408_upload-aebefe7d-1fe5-4a5a-bf2a-39f6818d4580
HDMI:
0_1471792962011_upload-1634a9c4-7f9b-475c-963a-d029227d31e3
PCH:
0_1471792973592_upload-db984f37-5903-4623-b3f0-cf9a7302c04a

Should I see more options on the HDMI tab in alsamixer? Can anyone point me in the direction why I only have sound for HD videos?

PS:

$ uname -r
4.7.1-1-ARCH