Missing display mode 2560x1080 on Windows 10 guest - popular on ultra wide monitors, no known workaround
I was trying to find a solution to the problem with no luck. It seems none of the qlxdod binaries provided by fedora or spice does not support this resolution, increasing memory to 64MB does not help either. I was reading it is possible to recompile the driver but that needs Microsoft signing to work without hacking. Please add this resolution as some people including me are struggling with not being able to use fullscreen mode on Windows kvm guest.