Forum Discussion

Copper Contributor

Dec 20, 2023

One core (out of 20) always running at 100% since 2023-12 update

I installed the 2023-12 update a few days ago and since then one core (out of 20) runs at 100% all the time. This does not happen if I boot into safe mode. I don't see a process with either Task ...

Update management

clemens_mike

Copper Contributor

Dec 20, 2023

Reza_Ameri

Same situation following a clean boot, one core running at 100% all the time.

Not there following a boot into safe mode.

Reza_Ameri

Silver Contributor

Dec 21, 2023

Try uninstall the update which causing this issue and see if the problem persists?
Have a look at:
https://support.microsoft.com/en-us/windows/how-to-uninstall-a-windows-update-c77b8f9b-e4dc-4e9f-a803-fdec12e59fb0

clemens_mike
Copper Contributor
Dec 21, 2023
Reza_Ameri
The only update that was in the list of those available for uninstall was a security update. Uninstalling it did not change anything.

The 2023-12 update (KB5033375) was not in the list of updates that could be uninstalled.

I believe the problem started just after the 2023-12 update was installed.
- Reza_Ameri
  Silver Contributor
  Dec 22, 2023
  Try open start and search for feedback and open the Feedback Hub app and report this issue.
  Is it Intel or AMD processor?
  - clemens_mike
    Copper Contributor
    Dec 22, 2023
    One thing I noticed is that starting or stopping an app such as Excel, PowerPoint, Thunderbird or Chrome causes a switch in which core is running at 100%, The change in core happens about the time the app finishes displaying its window.
    
    Starting other apps such as Explorer, NotePad++ or KeePass does not cause a switch in which core is running at 100%.