Possible duplicate of
https://bugs.launchpad.net/ubuntu/+source/acpi/+bug/967161

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https://bugs.launchpad.net/bugs/1016388

Title:
  Alienware M17xR3 continues running off battery when adapter is re-
  plugged

Status in “gnome-power-manager” package in Ubuntu:
  New

Bug description:
  If the power source is removed from the laptop at any time while my
  computer is running, and then re-plugged back in, the laptop fails to
  recognize the source and continues to run off the battery.

  The problem did not exist in Ubuntu until the latest kernel and nvidia
  driver update (lucid-backports, kernel version 3.0.0-21-generic).

  Some observations:
  1. If the power source is unplugged, the indicator does not switch to the 
"battery state" immediately, and only does so after about 4 seconds.
  2. If, however, it does change to show the "battery" icon, it never switches 
back to "charging" when plugged back in.
  3. The only way to get the battery to start charging again is to remove the 
battery when the laptop is plugged in (laptop switches off of course) and then 
boot back in.
  4. If the power source is reconnected before the power icon switches to the 
battery icon, the system continues running like nothing ever happened, and 
continues charging.
  5. When the battery has fallen into the non-charging state, even a regular 
power cycle will not get it to charge. Also, when in this state, the battery 
does not charge in Windows either (Windows however shows that a power source 
has been connected, but won't charge the battery). However, after doing the 
remove battery when plugged in trick, and booting into Windows, Windows 
properly recognizes when the adapter is plugged / unplugged and starts / stops 
charging accordingly.

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