NVIDIA offloading issue on Slowroll with Ideapad 320 and GeForce MX150. Previously configured to auto-offload and power down the GPU when not in use

At least not officially. Here another user had this working with a Pascal gpu but didn’t know either why or how:
https://forums.developer.nvidia.com/t/runtime-d3-support-on-lenovo-legion-5-ryzen-7-4800h-gtx-1660ti/192673/18
Noteworthy is that you seem to have enable coarse grained rtd3 while said user didn’t set it.