Why does the CPU usage reach 100% when laptop is plugged in?

Posted by Mayank on Super User See other posts from Super User or by Mayank
Published on 2012-03-19T03:04:10Z Indexed on 2012/12/17 11:05 UTC
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cpu-usage

I have an HP Elitebook 8440p with Windows 7 Ultimate, i7 Processor and 8 GB RAM.

For the last couple of days, when I plug-in my laptop for charging, the CPU usage shoots up to 100% and remains there for around 15 minutes. No offending process shows up in Task Manager/Process Explorer but the laptop is practically unusable for that time. The CPU usage becomes normal when I remove the power cord but shoots up again when plugged back. This is happening with different power adapters/wall sockets so it might not be a faulty adapter issue.

Why is this happening and any pointer to resolve this issue?

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