Automatically adjusts the brightness with the background of the window.

This is a fairly long description of the question, but I tried to be as complete as possible (this looks like a minor problem but it's very embarrassing in the conditions I work often) I have a laptop Dell Inspiron under Windows 7 Home Premium, and I'm having a problem with the brightness of the screen. I was not able to locate any other positions, even with a similar problem:

Windows automatically adjusts the brightness of the screen based on the background color of any windows is open. When the toggle between light/dark background brightness will increase or decrease respectively. This is unrelated to all conditions of lightning of the room, and I was able to nail that this occurs only when two conditions are met (but she she 100% reproducible in these conditions) 1. Laptop is running on battery and 2. the screen brightness slider is calibrated for lower brightness about settings up to about 30 to 40%.
I tried to eliminate all possible variables that I can think of, including the diagnosis via msconfig startup. This automatic brightness adjustment occurs independently of the program or the window involved, but here's an example where I cut everything and simply alternate between the Windows desktop (including the black background value) and Windows Explorer (white background).
EXAMPLE 1: Desktop (black) came, no agenda. I open Windows Explorer (white) and the brightness fades gradually more light for a period of 5 seconds, tick-tick-tick-tick-tick brighter. I reduce Windows Explorer (dark back) and the brightness fades gradually more dark, tick-tick-tick-tick darker. When working in a darkened room this very annoying constant increase or decrease the brightness. Note that the brightness slider is set to the minimum setting all this time (about 40% of the automatic erasure is more noticeable at the point of annoying, even if it is always present, but 40% is way too bright for a darkened room).
EXAMPLE 2: I opened two tabs in Google Chrome or Internet Explorer (that happens for two and all the other programs besides), in a tab of the page Web has a dark background (grey/brick/whatever) while the other tab has a light background (white/yellow/whatever). As I switch between tabs brightness will decrease after the passage in the darker background and rise after the transition to the lighter background, tick-tick-tick-tick-tick discoloration with about 5 seconds each time.
Since this only occurs on battery you need just a simple setting in Power Options, but I don't the do have not yet localized as and option. I would be grateful all the ideas, and I can provide more information if necessary. Two solutions would be acceptable
(A) brightness remains constant at the level that I put it independently to know if the laptop is plugged in or on battery power.
(B) brightness adjusts in a single 'jump' when switch between light/dark circles, rather than erasing more than 5 seconds.
Thanks for your help

In fact, after a lot of research and work of suggestions other people, I think I found a solution that works on my machine. (I'm saying I think because I shot to the top of a black web page, he gave way to the screen for a while and looked and seems not to reduce intensity, but I'm a little worried that it's just top-down influence and I just wanted to believe that I solved the problem...)

Here's what I did (on my Toshiba);
Control Panel > display > adjust the resolution
Click on 'Advanced settings' (a small blue link in the drop-down "Orientation").
Click on tab "Intel (R) Graphics and Media Control Panel"
Graphics properties
Power > power features
Click the menu drop-down and select 'on battery '. Under this drop-down menu, there is a checkbox next to "Display Power Saving Technology" that only appears when "on battery" is selected. On my computer, the box has been checked. I've disabled, and who seems to have stopped the display to change the brightness according to the color of the window.
I hope this works for some other people (and indeed works for me) - this seems to be a very rare but incredibly annoying problem for those of us who got it.

Tags: Windows

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