April 15, 20197 yr .... spent two days trying to figure out why the PCIe card you're trying to pass through to a VM isn't showing up in the list of available devices in the VM Editor when it did previously. Swapping cards, looking at the sysconfig.txt file a dozen times, copy-n-pasting the device ID multiple times, shuffling card order in the slots, trying different types of IOMMU settings and all to no avail and then you notice you typed "pci-sub.ids=1912:0015"
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