T420s - screen brightness increases and decreases

Hello

I noticed on my T420s that changes of screen brightness according to the image on the screen.

For example:

-I'm looking at some site with black background and gray letters

When I pass screen for my outlook or for example firefox with this forum which first minutes white white background is gray and then it becomes whiter and whiter until after about 2 seconds, he moved.

I thought at first my eyes question, but it is certainly behavior from my laptop.

Anyone with the same problem? Can do this set by some software/Power Manager tweak?

Do you use your laptop on battery when this happens?

It is a setting I believe you can disable in the Intel graphics settings. Mine does the same thing - it's supposed to save energy.

Tags: ThinkPad Notebooks

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