Failed to start LightDM after p2v

[SnakeP]

Hello,
I have an issue with a vm from a physical machine (T5810 xeon e1650 and GPU NVidia Quadro M2000)
My pve host also own a Quadro M2000 and I configured the GPU passthrough and added it to the VM without any problem.

The problem is that I encounter the Failed to start LightDM error during Centos 7 boot and stuck on it. Terminal or logging is unavailable so I can just run a rescue disk to acces my systemfile. I tried to change settings in VM hardware without any success. Any idea ?

 

[Kingneutron]

Try giving virtual VGA at least 128MB RAM (I use VirtIO-GPU), although with passthru IDK if it will help