I have a Compaq laptop and using Windows 7.

when I change the display brightness for example to 80% and then restart the system, after restarting the display gets dim again and I have to move around the brightness bar again.

Is it hardware problem or what?

  • Is this with the laptop plugged in or on battery power?
    – Mr Alpha
    Mar 19, 2011 at 11:20
  • both of them ..
    – C77431
    Mar 19, 2011 at 12:17
  • And just happens in restart, but in hibernate or sleep, there is no problem
    – C77431
    Mar 19, 2011 at 12:17

2 Answers 2


It might be your adaptive brightness adjusting automatically, at which point you can check out this info page on the Windows site to turn it off: http://windows.microsoft.com/en-US/windows7/Adjust-your-monitors-brightness-and-contrast


OK, Seems the problem was in Display Color Calibration. Now there is no problem, thanks to all.

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