Comment 21 for bug 1781891

First let me thank you for your quick and informative and very helpful responses.

Installing the mainline kernel is not really an option for the following reason: The server is at a client and was built about a month before Ubuntu 18.04 was released, so I opted to install Ubuntu Server 17.10 to get the latest updates in KVM and then upgrade to 18.04 as soon as it became available. This upgrade lead to PCI graphics adapter not forwarded (needed for 3D graphics used on VM) as well as the USB PCI card and it caused. Fortunately Christian got my heart rate back to normal after pointing out how I could fix the Graphics pass-through (which was at the time crucial to get the office firing on all cylinders). In the mean time I used other solutions to get round a number of USB issues (including falling back to a old VirtualBox VM for one application and using Dosbox for interfacing with a USB to Serial device). So at this point I am reluctant to try a kernel that is not released via the Ubuntu repositories as I think you can understand. How long do you think it will take for this current mainline kernel release you meniuned to make its way into Ubuntu repositories?

There is one side effect of the USB pass-through that I don't think I have mentioned to now, but I am not very clear on its relevance and even if this is a real issue. Every time I have ever worked with USB devices, I always relied on the USB device ID (e.g. 1d6b:0002). For some peculiar reason in the Windows 10 pro VM this ID is nowhere to be found when going through the device properties in the device manager. I only saw this after trying to identify the correct USB device for updating a driver and it might be that Windows just never show the ID, or it could be because of changes to the way USB devices connected to a USB controller card is now shared to a VM when only the card is passed to the VM using pass-through. The most likely explanation is that I try to steer clear of Windows wherever possible and therefore does not know too much on what to expect when I am faced with a situation where I have to look deeper. In any event, you would know best what to make of this.