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Display Dims When Laptop Is Unplugged from AC Power Source

Support for Windows XP has ended

Microsoft ended support for Windows XP on April 8, 2014. This change has affected your software updates and security options. Learn what this means for you and how to stay protected.

This article was previously published under Q307442
SYMPTOMS
When you unplug your portable computer from an AC power source so your computer is only using battery power, the display may dim.
CAUSE
This behavior can occur when Windows XP dims the display to reduce power consumption and improve battery life. Note that this only occurs if your computer's basic input/output system (BIOS) supports the alteration of the display brightness level when you are using battery power, and your computer is in Advanced Configuration Power Interface (ACPI) mode.
STATUS
This behavior is by design.
MORE INFORMATION
You cannot alter this behavior in Windows XP, but you may be able to alter this behavior in your computer's BIOS. To determine if you can alter this behavior in your computer's BIOS, view the documentation that is included with your computer.
Note If you use Windows Vista, you can visit the following Microsoft Web page for help with power consumption and battery life problems:
laptop
Properties

Article ID: 307442 - Last Review: 10/29/2001 20:37:00 - Revision: 1.2

  • Microsoft Windows XP Home Edition
  • Microsoft Windows XP Professional
  • kbdisplay kbenv kbprb KB307442
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