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CPU slows down when plugged-in

HP Pavilion Gaming 15-ec0016nm
Microsoft Windows 10 (64-bit)


I have a weird problem with CPU throttling. Laptop works fine on battery, but the moment I plug in the charging cable, CPU slows down to 400mhz. FPS in games falls drastically and laptop becomes useless. If I disconnect the cable, it works at full power again, instantly. I have read about similar problems, and most people solve it either by BIOS update or by replacing the power adapter (if it is not powerful enough). I tried that and it does not help - no matter what I try, CPU throttles at 400mhz when plugged in.  CPU in question is AMD Ryzen 5 3550H, and laptop is Pavilion 15-ec0016nm. 

Here is what I tried so far:

  • I re-installed windows 10
  • I checked my power adapter -  it is official HP 150W adapter provided with laptop (which should be enough)
  • I reset all BIOS settings to default
  • I updated the BIOS to the newest version
  • I updated all CPU and other drivers to newest versions
  • Under the windows power settings, I created a custom power plan and set min and max CPU power state to 100%
  • In GeForce experience app I disabled whisper mode and battery boost, everything that could artificially slow down the CPU
  • I made sure I'm not using any other programs that could interfere with CPU function

Since I use the laptop for gaming, this situation is very frustrating. I would appreciate any help!

HP Support Agent
HP Support Agent
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Message 2 of 2
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HP Recommended

CPU slows down when plugged-in



Welcome to the HP Support Community!


I reviewed your post and I understand that the CPU throttles when the AC adapter is connected.


Don’t worry, I assure you I will try my best to get this sorted.


I see that you have already followed all the relevant troubleshooting steps and I recommend you contact support to further diagnose the issue.


Here is how you can get in touch with support.


1)Click on this link –

2)Select the product type.

3)Enter the serial number of your device or select let HP detect your product option.

4)Select the country from the drop-down.

5)You should see the HP phone support number or Chat option listed.


Let me know how it goes and you have a great day!


If you wish to show appreciation for my efforts, mark my post as Accept as Solution. Your feedback counts!




I am an HP Employee

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