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I'm using AsRock B450 itx gaming and updated to latest BIOS version There is only one PCI-E slot and one m.2 slot, I use GT1030 for passthrough because the iGPU of 200GE not support passthrough

Just find 02:00.0 is the pci address 02:00.0 USB controller: Advanced Micro Devices, Inc. [AMD] 400 Series Chipset USB 3.1 XHCI Controller (rev 01) 02:00.1 SATA controller: Advanced Micro Devices, Inc. [AMD] 400 Series Chipset SATA Controller (rev 01) 02:00.2 PCI bridge: Advanced Micro Devices...

Bus 001 Device 002: ID 20b1:0008 XMOS Ltd HIFI DSD Device Descriptor: bLength 18 bDescriptorType 1 bcdUSB 2.00 bDeviceClass 239 Miscellaneous Device bDeviceSubClass 2 bDeviceProtocol 1 Interface Association...

Yes, I just noticed that one USB with ethernet, another one with iGPU for the same IOMMU group, is that possible to find which PCI device used for the USB audio? The only possible is pass the USB with ethernet, because I tried pass iGPU but PVE hang up.

Have you find anything? I even can pass USB DAC to Windows guest OS but no sound

Just pass through USB device and Windows 10 guest os can see it but with no sound Another HDMI audio works well lspci output 02:00.0 USB controller: Advanced Micro Devices, Inc. [AMD] 400 Series Chipset USB 3.1 XHCI Controller (rev 01) (prog-if 30 [XHCI]) Subsystem: ASMedia...

have you tried, I have the same problem with volumio