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GNOME Boxes: What is needed for 3D acceleration?

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Background: Running Kubuntu in a GNOME Boxes virtual machine has missing desktop switching effects.

Elsewhere, it has been suggested that this may be due to missing 3D acceleration. In VirtualBox with 3D acceleration, the effects show (without it, KDE complains).

The GNOME Boxes website states that 3D Acceleration is supported if both guest and host virtual machines support it. I therefore hope to make my guest and host support 3D acceleration.

Problem: GNOME Boxes does not show a 3D acceleration for the virtual machine. I have tried Boxes 40, 41 and 42 (alpha).

Question: What are the prerequisites for guest and host VMs to support GNOME Boxes 3D acceleration?

user598527 avatar
mp flag
There's a line `<acceleration accel3d="no"/>` in the Libvrt configuration line for Ubuntu 22.04 LTS, but changing to `yes` (and restarting the VM) appears to have no effect.
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