T420s changes automatic display brightness

I have set up the screen brightness in Windows, but when I restart my computer and log in to windows, automatic change of the brightness in Max and after a few seconds, he reduced to the brightness level of what I install.

Why my old T500 do not have such a problem, it seems that he can recall the brightness I set up.

I tried to update the graphics driver, but it didn't work.

Finally I have the solution.

Windows always load high performance first at startup, then move to the power that you set.

This is the reason why it auto changes the brightness at the start.

Then I change the brightness option high performance directly and the problem solved.

Tags: ThinkPad Notebooks

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