Comment 106 for bug 1428121

I have a problem with HDMI audio on Haswell integrated video that may be related as described in this PulseAudio bug report:

https://bugs.freedesktop.org/show_bug.cgi?id=94804

If I have "intel_iommu=on" on the kernel command line without adding "igfx_off", the HDMI audio works, but with significant timing problems. When playing a video, either the audio and video quickly start to drift out of sync, up to a few seconds off, or (in VLC's case) it starts having audio dropouts and complaining like this:

core warning: picture is too late to be displayed (missing 25 ms)
core debug: picture might be displayed late (missing 13 ms)
core warning: playback way too early (-121209): playing silence
core debug: inserting 5818 zeroes
core warning: playback too early (-40158): down-sampling
core warning: timing screwed (drift: -81704 us): stopping resampling
core warning: playback too early (-82366): down-sampling
core warning: playback way too early (-121032): playing silence
core debug: inserting 5809 zeroes
core debug: auto hiding mouse cursor
core warning: playback too early (-40230): down-sampling
core debug: auto hiding mouse cursor
core warning: timing screwed (drift: -80762 us): stopping resampling
core warning: playback too early (-81447): down-sampling
core warning: playback way too early (-120541): playing silence
core debug: inserting 5785 zeroes