This happens when, in Blender settings, I enable both my graphics card and my CPU for CUDA. Whenever I render out an image, it progresses normally, however, a couple tiles in the center (The ones that the render started with) are very very noisy, and aren't finished. I have waited up to an hour, and no further change has occured. This is running on blender 2.81 from Pacman repos on Manjaro Linux. I cannot seem to figure out what causes this to happen, as it doesn't happen in some scenes, in others it does. Perhaps it's complexity, yet some scenes with just 51k verts cause this to happen.
This doesn't happen on CPU compute OR GPU compute alone, however that is obviously far slower. This also occurs when rendering via command line:
