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I got this laptop: Dell Inspiron N5010 with i5 2,40GHz processor, 8GB Memory and a Kingston SSD.

4 months ago my charger`s pin jack has broken, but it was still working. I noticed that the performance had decreased drastically when the charger was plugged in, so i bought a new charger, and all was working fine.

Last week my laptop was very laggy so i decided to reinstall Windows 8. After a clean installation, the same problems occurs with the charger.

When the charger is plugged in ( even if the battery is inside or outside ) the performance if very low. When i remove the charger and start the laptop with the battery the laptop works perfect.

The power options are set to High Performance in both cases.

So what should be the problem ?

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    Many Dell laptops check to see if you use a Dell charger. If they cannot detect this (e.g. because a pin has broken) they go to a minimum performance mode. This is well known and documented. Nice to know that disabling speedstep negates that.
    – Hennes
    Oct 30, 2017 at 18:02

2 Answers 2

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After reading a lot of documentation over the Internet, I found out how to fix this after I read this Superuser thread:

How do I stop laptop from underclocking?

I disabled the SpeedStep option in the BIOS and now my laptop works fine.

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  • No, i have same problem with lenovo g580 simple i bought new charger and it works perfect if you cant purchane new charger you should repair it otherwise issue will remain the same
    – Tara
    Oct 18, 2018 at 11:03
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I had the same issue with an old Latitude 6530. I was charging it with an original Dell charger, which suddenly started to slow down the pc. I didn´t know about the BIOS SpeedStep setting but changing the AC charger worked for me (I'm using a 3rd party and/or another Dell one I have at home and both work seamlessly). Another thing, the faulty charger was giving 18.8-19.0 Volts as output (tested that myself) instead of 19.5 volts.

Hope this also helps some other superUser out there.

Cheers.

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