Le anonymous faker, I am also having a similar issue. I have an i5 4690K Haswell (Devil's Canyon). I use HDMI out to an HD TV from an ASRock Z97 Extreme6 motherboard. After adding "intel_iommu=on" to GRUB, updating and rebooting, Debian Testing appears to see it but no audio is emitted from the TV speakers.
I am successfully passing through my Nvidia GTX 970 dedicated ASUS STRIX PCI card to Windows 8.1 Pro via the PCI/GPU Passthrough method with both graphics and audio in order to play games unavailable to Linux. I would like to use my iGPU for Linux with sound over HDMI while running the Linux host and the Windows VM client. The "igfx=off" switch does not appear to be a solution since you have stated that it breaks iommu for this purpose. I may have missed something but I suppose that to date a solution is not actively being sought as it may be impossible for this integrated issue to be resolved on Haswell based CPU's. It is the only observable problem to an otherwise perfect use case for Haswell class, Linux based, Windows game play without dual booting. The intention wasn't to use Windows full time on Linux as I might as well just use Windows alone. I don't want to use Windows as my primary OS but contain it within a VM until a better option for gaming becomes available. Despite this, I am extremely impressed and appreciative of Alex and everyone involved for making this possible. Thank you for this interesting, useful and very cool innovation. If I stumble onto a solution I will pass it on. REPOST
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