While using the official Blender 2.81 release for the first time (the last time I used Blender 2.81, it was still in Beta) I encountered a strange phenomenon while hybrid rendering in Cycles.
If I start a render with only my CPU enabled as a CUDA device my Ryzen 3600 chews through the 8100 tiles in about 3 minutes.
However if I additionally enable my GTX 970 and use both in hybrid mode my CPU seems to stand still not finishing a single tile.
The remaining time of 0.08 seconds is frozen as well, indicating that something is going horribly wrong. My system monitor is showing 100% CPU utilization, which is even more confusing to me. What is my CPU doing the entire time?
I have to mention, that I'm using Manjaro Linux and the AMD Catalyst driver-package has been discontinued recently, although that should only affect graphics cards not CPUs and my CPU has been rendering just fine on it's own.
Does anyone know how to fix this issue?