Brightness automatically adjusts with background of window.

This is a rather long description of the question but I've tried to be as complete as possible (it sounds like a minor issue but it is very annoying under the conditions I'm often working in) I have a Dell Inspiron laptop running Windows 7 Home Premium, and I'm having an issue with screen brightness. I have not been able to locate any other posts yet with a similar problem:

Windows is automatically adjusting the brightness of the screen based on the background color of whichever windows is open. When toggling between dark/light background the brightness will decrease/increase respectively. This is not tied at all to the lightning conditions of the room, and I've been able nail down that this only happens when two conditions are met (but it it 100% reproducible under these conditions) 1. Laptop is running on battery, and 2. screen brightness slider is adjusted to the lower brightness settings approximately up to about 30-40%. 

I've tried eliminating every possible variable that I can think of, including diagnostic startup through msconfig. This automatic brightness adjustment occurs regardless of the program or window involved, but here is an example where i've cut out everything and simply toggle between the Windows Desktop (with background set to black) and Windows Explorer (white background).

EXAMPLE 1: Desktop (black) is up, no programs loaded. I open Windows Explorer (white) and the brightness gradually fades brighter for a period of about 5 seconds, tick-tick-tick-tick-tick brighter. I minimize Windows Explorer (returning to black background) and the brightness gradually fades darker, tick-tick-tick-tick darker. When working in a blacked-out room this constant increasing/decreasing of brightness very annoying. Note that the brightness slider is set to the minimum setting this whole time (at approximately 40% the automatic fading is no longer noticeable to the point of annoying, although it is still present, but 40% is much too bright for a blacked-out room). 

EXAMPLE 2: I open two tabs in either Google Chrome or Internet Explorer (happens for both, and all other programs for that matter), in one tab the webpage has a dark background (grey/brick/whatever) while the other tab has a light background (white/yellow/whatever). As I toggle between the tabs the brightness will decrease after switching to the darker background and increase after switching to the lighter background, fading tick-tick-tick-tick-tick over about 5 seconds each time.

Since this only happens on battery it should be just a simple setting in Power Options, but I have not yet located such and option. I would appreciate any ideas, and I can supply further information if needed. Two solutions would be acceptable

A) brightness remains constant at the level I set it regardless of whether laptop is plugged in or on battery.
B) brightness adjusts in one single "jump" when toggling between light/dark backgrounds, rather than fading over 5 seconds.

Thanks for your assistance
 

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Last updated October 10, 2019 Views 28,076 Applies to:
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Actually, after quite a lot of searching and working from other people's suggestions, I think I've found a solution that works on my machine. (I say I think because I pulled up a black web page, left it up on the screen for a while, and stared at it, and it didn't seem to dim, but I'm a little worried that it's just top-down influence and me just wanting to believe I've fixed the problem...)

Here's what I did (on my Toshiba);

Control Panel > Display > Adjust Resolution

Click on "Advanced Settings" (a small blue link beneath the "Orientation" drop-down menu).

Click "Intel (R) Graphics and Media Control Panel" tab

Graphics Properties

Power > Power Features

Click the drop-down menu and select "On battery". Underneath this drop-down, there's a checkbox next to "Display Power Saving Technology" that only appears when "On battery" is selected. On my computer, the box was checked. I unchecked it, and that seemed to stop the display from changing brightness as a function of window color.

I hope this actually works for some other people (and indeed works for me) - this seems to be a very rare problem, but incredibly annoying for those of us who have got it.

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Sorry it took a few days to get back. Here is what fixed this for me, I hope this helps! (see the screenshots at the bottom)

1. Right-Click on Desktop and select "Graphics Properties"

2. Use "Advanced Mode" and click OK

3. On the left select "Power", then on the top-right, use the Power-Source drop-down to select "On Battery"

4. Click to Un-check the box near the bottom that says "Display Power Saving Technology"

5. Click Apply and test whether this worked.

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