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Why is my laptop slowing down when I connect the charger?

asked 2011-11-29 13:27:12 +0000

hauf gravatar image

updated 2011-11-30 12:10:46 +0000

I have encountered a strange issue on my Lenovo edge 13 (1,3 GHz C2D, 4 gb ram and Intel GMA 4500MHD) running F16 64-bit (same problem on F15). When I connect the charger it slows down to a crawl. It can take anywhere from 5 seconds to a couple of hours but it will inevitably happen.

When this happens I have two options, either leave the computer until it somehow sorts itself out after a couple of hours or restart it by holding down the power button. The cpu and the memory load stays low and I have tried a different hard disk with no change in behavior.

My first guess was that it started swapping, but with over 2Gb of free memory why would it?

I would really appreciate if someone could help me solve this.

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answered 2011-11-29 16:27:53 +0000


Can you please note the following before and after plugging in the laptop and post them to a pasting service (fpaste.org for example)?

  • dmesg
  • /var/log/messages


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Please run top and iotop and see what process is slowing the system down. If it isn't this, it would probably be some sort of cpu frequency scaling that comes into play.

FranciscoD_ ( 2011-11-30 10:12:12 +0000 )edit

I still don't understand how your power cable would trigger this.. but then.. we managed to solve it .. ;)

FranciscoD_ ( 2011-11-30 12:09:46 +0000 )edit

answered 2012-03-15 17:48:39 +0000

TatsuyaLam gravatar image

updated 2012-03-16 07:52:45 +0000

Hi all,

I face the same problem. I use F16-64bit on HP Pavilion dm4 currently. My laptop become slower when i use a long time (with charging). Especially when i have a running virtual box instance.

Please help me to review and provide the solution :(


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Asked: 2011-11-29 13:27:12 +0000

Seen: 8,051 times

Last updated: Mar 16 '12