Since I installed the new nVIDIA drivers (576.28) on my laptop, the dGPU remains active all the time while HWinfo is running. Only when I exit HWINFO does the dGPU switch off and on as it should.
Yes sir, version 8.24-5700. When I switched back to the old drivers (572.83), everything started working normally again; dgpu goes on and off while hwinfo is running.