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  1. Has anybody else seen their GPU and HD audio device in the same card split into two separate IOMMU groups? I can't seem to find a way to merge them: [root@tiamat kvm]# lspci | grep 4b 4b:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Navi 10 [Radeon RX 5600 OEM/5600 XT / 5700/5700 XT] (rev c4) 4b:00.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Navi 10 HDMI Audio [root@tiamat kvm]# iommu | grep 4b /sys/kernel/iommu_groups/53/devices/0000:4b:00.0 /sys/kernel/iommu_groups/54/devices/0000:4b:00.1 [root@tiamat kvm]# I don't know if this is what is causing me grief or what... At one point I managed to get the GPU passed through to Windows10, but the audio over HDMI did not work.
  2. Has anybody managed to successfully pass through a GPU to a KVM/Qemu VM on an Asus Rog Zenith II Extreme Alpha TRX40 board? I've has success with the Asrock Creator TRX40 board, but this new one is not working out so well. Linux just refuses to use anything other than software bounce buffers for DMA, and no DMAR in sight. I've tried every combination of kernel command line settings and related BIOS setting that I can find, but nothing seems to matter. Rather than go through every combination I've tried, I figured I'd first ask if anybody managed to get it to work, and if so, what were the related BIOS settings and/or kernel command line used that ended up working for them. Thanks!