Laptop slows down while charging battery

Laptop Model: Dell Lattitude 5440

OS: Ubuntu 12.04.

While charging my laptop battery i've noticed the following:

1. Mouse pointer moves very slowly.
2. computer also slows a bit.

This problem was not observed on windows 7.

Thanks

2 Answers

Since that fix does not work any more on Ubuntu 16.04 with kernel 4.4.0-25 on my DELL E5440 laptop, the solution for me is to use a 90W battery charger (instead of the 65W).

I found the idea on a post on the bug report by Till Seuring.

• Open /etc/modprobe.d/local.conf.

  gksudo gedit /etc/modprobe.d/local.conf

• Add the following line:

  options drm_kms_helper poll=N

• Restart.

As mentioned here on Ubuntu forums, if you don't have local.conf file you can also try editing alsa-base.conf.

It is also a bug and is reported here: .