No Sound over HDMI with Intel Core i7-4771?

[Nils]

Hi!

I recently upgraded my System to a Intel Core i7-4771 on a ASRock Z87 Pro4 with 16 GB RAM and I have problems getting sound out of the HDMI output. When I for example want to play something with mplayer, I don't hear any sound and the play time goes very fast. Same with vlc, but it also throws lots of the following error at me:

[0x1e0a208] alsa audio output error: cannot estimate delay: Broken pipe

I have the following sound-related modules loaded:

% lsmod | grep snd
snd_hda_codec_hdmi     36379  1 
snd_hda_codec_realtek    45115  1 
snd_hda_intel          37352  2 
snd_hda_codec         150017  3 snd_hda_codec_realtek,snd_hda_codec_hdmi,snd_hda_intel
snd_hwdep               6332  1 snd_hda_codec
snd_pcm                77822  3 snd_hda_codec_hdmi,snd_hda_codec,snd_hda_intel
snd_page_alloc          7298  2 snd_pcm,snd_hda_intel
snd_seq_dummy           1463  0 
snd_seq_oss            29264  0 
snd_seq_midi_event      5628  1 snd_seq_oss
snd_seq                50170  5 snd_seq_midi_event,snd_seq_oss,snd_seq_dummy
snd_seq_device          5180  3 snd_seq,snd_seq_oss,snd_seq_dummy
snd_timer              18718  2 snd_pcm,snd_seq
snd                    59029  14 snd_hda_codec_realtek,snd_hwdep,snd_timer,snd_hda_codec_hdmi,snd_pcm,snd_seq,snd_hda_codec,snd_hda_intel,snd_seq_oss,snd_seq_device
soundcore               5418  1 snd

And the HDMI output is also detected:

% 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

All three HMDI devices are unmuted in alsamixer.

It's the same with every of the three (?) HDMI outputs. I'm using ArchLinux.

Am I missing something or is it known to not yet work properly?

Thanks! Greetings,
Nils

[droste]

Probably not a solution for you, but did you try it with pulseaudio? I also had trouble with the HDMI output in the past, but since I'm using pulseaudio I never had problems. Even though it's using alsa it might setup things differently.

[Nils]

Unfortunately, it's the same with pulseaudio. Also, in pavucontrol, it says that HDMI is unplugged, even though I can the the image on the TV.

[droste]

Best thing to do would be to file a bug against snd_hda_intel in the kernel bugzilla.

[Nils]

Looks like I have this Bug:

https://bugzilla.kernel.org/show_bug.cgi?id=61471

[droste]

Well booting with intel_iommu=igfx_off or intel_iommu=off seems to fix it, so why the sad face? Do you actually need this?

[Nils]

Yes, I actually need this. I use IOMMU to virtualize A Windows 7 with a Radeon HD 6870 pass-throughed and the internal Graphics for Linux.

[droste]

But shouldn't intel_iommu=on,igfx_off then work for you? If I understand this correctly this would just turn off DMAR for intel and you don't use it in the windows client. So it should do no harm!?

[Nils]

Yes, this works. But only when using KVM. Unfortunately not with Xen, which I'm using.