Guerlan:
I only have one GPU, which is an Intel UDH graphics. Obviously Qubes uses
it to display graphics. However, I think it's theoretically possible to
disable my GPU from dom0 and do a PCI passthrough to another VM, which will
then appear as fullscreen (I will not be able to use Qubes meanwhile). Then
when I need Qubes again I can simply reattach the GPU to dom0.

Is it really possible, and if so, could someone guide me into how to
achieve this?

I mainly want this because my laptop don't have a dedicated GPU and I'm
developing an application which decodes video and sometimes I need to test
GPU decoding. It'd be also fun to play some video games.

Not really any way to do that with Qubes. It is less than ideal for security, but you might consider dual boot.

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