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When I am using my laptop, I continually adjust the screen's brightness based on the lighting conditions in the room (e.g. how much light is coming in from windows, etc.). But if I unplug the laptop or plug it back in, Windows looks at the default brightness setting in the power profile for "on battery" or "plugged in" and changes the brightness accordingly. This is a jarring experience and then I have to hunt down the ideal brightness for my current situation again, rather than getting on with my work.

I would like to make it so that plugging or unplugging the battery is not a trigger that adjusts the screen brightness at all. The screen brightness should only change when I adjust it myself. Does anybody know how this might be accomplished?

Edit: I have encountered this issue in both Windows Vista and Windows 7.

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That setting is in the power options in Windows. –  Moab Sep 7 '12 at 2:24
    
Moab, I don't believe there is a setting for this in the power options. See reply to the answer below. –  Nomad Sep 7 '12 at 3:12
    
Telling us what version of Windows you're running would help. And the brand of the laptop. –  Daniel R Hicks Nov 24 '12 at 13:54
    
Daniel, thanks for the suggestion. I've now added this information above. –  Nomad Nov 25 '12 at 23:26
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5 Answers

windows 7,

look in the Control Panel\Hardware and Sound\Power Options\Edit Plan Settings\

On Battery or Plugged In

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None of the options I see in Plan Settings will help. I have to select a default brightness for "On Battery" and a default brightness for "Plugged In". Thus, whenever I plug in or unplug the laptop, it checks the relevant default setting and adjusts it to that. But what I want is for nothing to happen when I unplug or plug in the laptop. Please correct me if there is something I am not seeing in those settings. –  Nomad Sep 7 '12 at 3:11
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Open Power Options > Change Plan Settings (for the power plan that has the radio button selected) > Change Advanced Power Settings > Display > Display Brightness

Set "On Battery" to the same percentage as "plugged in" by left clicking the "on battery" text

enter image description here

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That doesn't help. Please read everything I wrote above. Also, let me explain what happens when I use your suggestion. I set the "on battery" and "plugged in" both to same setting, for example 50%. Then, because too much light in coming in from the windows of the house, I adjust the brightness up to 100% (using the shortcut keys, not using the power profile, because that's a lot of screens to click through, considering the sun might go behind a cloud a few seconds later). When I unplug the computer, it resets to 50%. I don't want that to happen. –  Nomad Sep 7 '12 at 18:15
    
All I can suggest is to see if there is a screen brightness setting in the bios, some laptops have this some don't –  Moab Sep 7 '12 at 18:30
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Below dimmed display brightness should be enable adaptive brightness. Turn that off and it will stay the same brightness whether it's bright or dark.

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It sounds like you misunderstood. I like to adjust the brightness manually (and my computer does not have an adaptive brightness feature anyway). What I want to stop is how the brightness it automatically reset whenever I plug in or unplug the laptop power. –  Nomad Aug 12 '13 at 16:16
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For me (on an HP EliteBook 8570w), I had to change a graphics card power settings:

Control Panel -> Power Options -> Edit Plan Settings -> Change advanced power settings -> ATI Graphics Power Settings -> ATI Powerplay Settings -> On battery to "Maximize Performance" instead of “Maximize Battery Life”

You will also, of course, want to make sure the Display Brightness on battery is set to 100% as others have mentioned.

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For all HP/Compaq Laptops could this be working: - look at section "Adjust the LCD brightness using the function keys" http://h10025.www1.hp.com/ewfrf/wc/document?cc=us&lc=en&docname=c00832191

I unplugged the AC adapter/charger and pressed Fn+F8 (2-3 times should get to 100%) to bright up the display; Fn+F7 to lower the brightness. I had to plug in the AC adapter and unplug it so the changes I made, would show.

Using the Control Panel -> "Video Driver Name"[*] -> Display Settings -> Power Settings -> Intel Display Power Saving Technology -> Maximum Quality vs. Maximum Battery => Didn't do anything to me, but maybe was necessary a computer restart...

[*] (mine is Intel GMA Driver for Mobile) and it could be ATI, etc. as well.

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