I wanted to change my computation device, but there is no dropdown menu to change it The title already says it all.



How can I change the device?
EDIT: Yes, I have a (Nvidia) graphics card and CUDA installed

I've got a GeForce GTX 960M with updated drivers
Additionally to installing the drivers and Cuda, I had to choose the NVidia card as the card used for rendering (hybrid card), by runningsudo prime-select nvidia and log off and in again, afterwards it works.
This is now really off-topic.