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Screen backlight

Discussion in 'Hardware' started by ollie90680, Mar 19, 2007.

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  1. ollie90680

    ollie90680 Thread Starter

    Joined:
    Feb 27, 2007
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    I have an HP Pavilon ze5570us laptop which when AC power is removed dims the backlight on the screen. This is normal I know but I need to keep the backlight intensity at high because it is necessary for my eyesight. I cannot figure out how to change the intensity. I have tried the power settings but this does not seem to make any difference. Does anyone know what I can do?
     
  2. TRS-80 vet

    TRS-80 vet Account Closed

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    If you've tried all 6 of the [XP] power schemes, maybe the battery even when fully charged just doesn't supply the same amperage as the AC adapter...

    How old is the laptop?
     
  3. ollie90680

    ollie90680 Thread Starter

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    Yes, I have tried the other power profiles and have not found any that provide for full screen intensity with AC power off.
    The computer is 2 years old. The battery was just replaced a week ago. The battery doesn't have any problem supplying the necessary current required by the laptop for all systems at full power. Batteries are rated in AH's (Amps multiplied by Hours) and based upon a specified period of time; typically this is a 20 Hour rate for a battery of this type. If you are familiar with battery curves you know that it is not a linear function but instead more expodential. Battery backup time is severly compromised by large current drain and therefore they use the step CPU and lower intensity to reduce power and increase backup time. I don't care about the time as intensity is more critical to me. I have difficulty seeing the display. I need that backlight.
    Thanks for responding and offering your advice.
     
  4. Alex Ethridge

    Alex Ethridge

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    Apr 10, 2000
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    Fn+F1 decreases brightness
    Fn+F2 increases brightness

    Have you tried these?
     
  5. ollie90680

    ollie90680 Thread Starter

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    Feb 27, 2007
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    Alex,
    Thank you. That is the answer that I needed. It does indeed change the intensity of the LCD screen even when on battery power.
     
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