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How to enable automatic screen resolution adaption on KVM guest OS?


I am using virt-manager to run a few GNU Linux guests to be able to show them to a friend who wants to migrate to Linux but I am not able to run the libvirt guests in full screen (or whatever size the guest window has).

Settings are: Hypervisor: KVM, Emulator: /usr/bin/qemu/kvm. I am using Spice as display server, and for video I have tried vga, vmvga, qxl, and cirrus - none of them changed the behavior.

Guests are Ubuntu 16.04 and Elementary OS. Are there any additional drivers that I have to install on the guest OS'?

Or what I am doing wrong here?