Ubuntu 17.04 with 4.10.0-21, libvirt 2.5.0, QEMU 2.8, and virt-manager 1.3.2. Gigabyte EX58-UD3R Rev 1.6, ICH10 (00:1b.0) audio, x5675 (Westmere). Nvidia GTX 275 for the host, GTX 1050 Ti for the VM.
Added to /etc/default/grub, updated grub, rebooted, and replaced the previous entry each time: intel_iommu=igfx_off (Audio works, breaks IOMMU) intel_iommu=on,igfx_off (Breaks audio) intel_iommu=on,igfx_off snd_hda_intel.align_buffer_size=1 (Breaks audio) intel_iommu=on iommu=pt (Breaks audio) dmesg gives with intel_iommu=on: DMAR: [DMA Read] Request device [00:1b.0] fault addr ffffb000 [fault reason 02] Present bit in context entry is clear THE FIX: Alex Williamson created a patch that was verified by Matthieu Speder https://bugzilla.kernel.org/show_bug.cgi?id=76331 https://patchwork.kernel.org/patch/4505951/ ** Bug watch added: Linux Kernel Bug Tracker #76331 https://bugzilla.kernel.org/show_bug.cgi?id=76331 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1428121 Title: Intel HDMI Audio not working with IOMMU enabled To manage notifications about this bug go to: https://bugs.launchpad.net/alsa-driver/+bug/1428121/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
