Which wiki are you following to setup your environment ?
It seems you are using GVT-d, in this case monitor may be black if you bios is native uefi. But you could install a vnc server in your windows guest and let vnc server auto start at windows boot, so you could connect to windows guest through vnc viewer on another machine.
From: iGVT-g [mailto:email@example.com]
On Behalf Of Iarwain Ben-adar
Sent: Tuesday, September 5, 2017 12:16 AM
To: Richard Lagler <firstname.lastname@example.org>; email@example.com
Subject: Re: [iGVT-g] Windows 8.1 Guest - vgpu can't be used as monitor
I install TeamViewer using vnc and the qxl gpu, and then I use TeamViewer.
On Mon, Sep 4, 2017, 11:35 Richard Lagler <firstname.lastname@example.org> wrote:
I use Win 8.1 guest and passed through an Intel HD 520, installed successfully latest driver 188.8.131.5248, but I can't enable the graphics card in the display settings. In Win 8.1 setup is default as an extended display, but no matter how I change the settings (change primary display, "show desktop only on Intel HD520", the card doesn't start working. In device manager all looks normal.
Even if I disable the Redhat QXL graphics card in the device manager, the monitor just turns black.
Tried with VNC and SPICE. Tried virt-manager, spicy, remote-viewer. No chance.
Further, when the vgpu is passed through, I start to have mouse issues. Mostly no mouse is visible, sometimes mouse is only invisible but useable. Tried passthrough an extra mouse, no effect.
What is best practice? How you use the Windows machine with the vgpu?
Help is very much appreciated!