CPU speed drops when charging

[yaudette]

Hi,

when the battery is fully charged, the computer works perfectly but as soon as I plug in the AC adapter the CPU speed drops to 0,38 GHz no matter the level of the battery. As soon as I remove the adapter, the speed goes up  to whatever is required by the system.

Initially, I thought that the adapter was wrong so I have ordered a new one to discover that I end up with the same problem.

I have created my own set of options for the power management thus bypassing the HP recommended parameters but it did not change anything.

By the way, the BIOS is the most recent version and Windows 10 is also up to date. I use this notebook for streaming basically.

The consequence of this situation is whenever the battery is low and I want to keep using the notebook, it becomes incredibly slow.

Any idea?

[yaudette · Accepted solution]

I have figured out what is causing this situation. It is related to passive and active cooling modes that are part of  advanced configuration and power interface for the power management of the CPU. 

I took an image of the laptop and then I installed Windows 10 from scratch. Once done, I checked whether the fact of connecting the AC adapter was having an impact on the CPU speed and it was the case. I can now restore my image knowing that there was nothing wrong with the image. The default cooling option for the CPU when the AC adapter is connected is active and this is what is causing the CPU to drop its speed. The cooling option for the CPU when the AC adapter is connected  was active in my image and it is exactly the same with the new installation of Windows 10.

This case is now closed.