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 fro m 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. From: Le anonymous faker <etfaker bestmail ws> To: Colin Godsey <crgodsey gmail com> Cc: vfio-users redhat com Subject: Re: [vfio-users] intel_iommu=on breaks audio on haswell cpu Date: Tue, 24 May 2016 06:56:06 +0200 .... "intel_iommu=on,igfx_off" means that HDMI audio output will work but PCI passthrough won't. I already tried this, with lots of outputs: https://bbs.archlinux.org/viewtopic.php?id=204460 Thanks ! 2016-05-21 19:09 GMT+02:00 Colin Godsey <crgodsey gmail com>: intel_iommu=on,igfx_off should work On Sat, May 21, 2016 at 11:01 AM Le anonymous faker <etfaker bestmail ws> wrote: Lė Patrick 🚗👔☀ Sneida: Hey there, just recently I discovered that the kernel command line "intel_iommu=on" breaks audio output (glitching/freezing output via laptop speakers, no output at all via HDMI) for owners of haswell cpu's. Changing it to "intel_iommu=igfx_off" resolved the issue. How ever, in order to use PCI passthrough of my NVIDIA Card to VirtualBox, I need the parameter "intel_immou=on" ? Is there a way to fix the audio glitching with intel_iommu=on ? Is there a way to get nvidia pci passthrough to working without intel_iommu=on (e.g. intel_iommu=igfx_off) ? Lots of outputs and other users reporting: https://bbs.archlinux.org/viewtopic.php?id=204460 https: //bugzilla.kernel.org/show_bug.cgi?id=60769 Kind regards !_______________________________________________ vfio-users mailing list vfio-users redhat com https://www.redhat.com/mailman/listinfo/vfio-users _______________________________________________ vfio-users mailing list vfio-users@redhat.com https://www.redhat.com/mailman/listinfo/vfio-users
