Cycles Render Device not available I was working on a smoke sim in 2.78c and when I tried to render, I got nothing. I noticed my device was set to GPU Rendering (with no GPU in my laptop) so I set it back to CPU. Nothing. I checked User Preferences, and it shows None in Cycles Compute Device. I reloaded the factory settings, but it still gives me nothing for compute devices. I'm pretty sure I still have a CPU...? Anyone know what might be causing this?
Compute Device None is a bit misleading here – it just means, that there's no GPU available. The scene will be computed by your CPU. Your invisible smoke is quite another matter and should be handled in a separate question.