Just for clarification what I want to achieve, so we are all on the same page:
I have 2 VMs (1x Win10, 1x Linux) which get all the fancy hardware assigned (GFX, Audio and also USB Ports passed through, but this is not done yet). Mainly I work on my Linux machine, but there are some special cases (Visual Studio, Adobe Tools, Games) where I want to shut down the Linux VM and boot up the Windows VM (I also thought about a script which boots VM-A up when VM-B is shutdown, so I can easily switch, is this possible or are there any solutions to this?)
Ok now there is some update about the issue:
For some reason my Windows VM now works with SoundCard, no problems (Maybe Unraid Reboot or i am just dump, who knows). My Linux VM on the other side, does not work. It starts without any issues but I don´t get a video signal.
When I check the VM Log there are no errors, but what I found anyway was the following:
2020-03-23T12:12:36.497442Z qemu-system-x86_64: vfio: Cannot reset device 0000:0a:00.3, depends on group 29 which is not owned.
2020-03-23T12:12:36.505182Z qemu-system-x86_64: vfio: Cannot reset device 0000:41:00.1, depends on group 43 which is not owned.
2020-03-23T12:12:36.511301Z qemu-system-x86_64: vfio: Cannot reset device 0000:0a:00.3, depends on group 29 which is not owned.
Then I checked what devices are in both of these groups:
IOMMU group 29:[1022:1455] 0a:00.0 Non-Essential Instrumentation : Advanced Micro Devices, Inc. [AMD] Zeppelin/Renoir PCIe Dummy Function
IOMMU group 43:[10de:1ad8] 41:00.2 USB controller: NVIDIA Corporation TU104 USB 3.1 Host Controller (rev a1)
As far as I understand, the means they are not able to [RESET] (at least the USB 3.1/USB-C Port on the NVIDIA), but I ain´t got an Idea how to solve this, or if this is really part of the main issue for me not getting video output when the onBoard audio is added. To find out I tried to reboot the Unraid server and see if the VM got the same issues if the windows VM was not started before and it does. So I don´t think these devices not able to reset play any role in this issue, but on the other side, I am not really an expert
Any insights / help would be great.