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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.


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  • 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, 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:

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I have done this but could not solve the problem. – rayhan Nov 20 '12 at 1:57

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