T420s - screen brightness increases and decreases

Hi,
I have noticed on my T420s that screen changes screen brightness depending on the picture on the screen.
For example:
- I look at some site with dark background and few grey letters
when I switch screen to my outlook or for example firefox with this forum that has white background at first few minutes white is gray and then it gradually becomes whiter and whiter until after about 2 seconds it settles.
I thought at first my eyes have issue, but it is definetly behaviour of my laptop.
Anyone with the same issue? Can this be fixed by some software/power manager tweak?
Solved!
Go to Solution.

Yes, I run it on battery and with Intel HD
It is display power saving thing - thank you

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T420s - screen brightness increases and decreases

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