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ThinkPad NotebooksThinkPad T400 / T500 and newer T series Laptops Knowledge Base

T510 screen automatically dims and brightens - how to change dynamic brightness control settings



I have a T510 with nvidia nvs 3100m graphic card windows 7 professional 64 bit, and for the past few months the windows login screen brightness automatically dims and then after windows open within few seconds brightness is restored. It happens on an intermittent basis. I have updated my BIOS, windows and GPU as well,  but that made no difference.



This can easily be adjusted via a setting change in  Power Manager.


Open up Power Manager (right click on battery icon in task bar).


Switch to Advanced mode.


Go to the tab Global Power Settings.


Choose the menu "Dynamic Brightness Control" and uncheck the checkboxes to disable this feature:


Dynamic Brightness Control in Power Manager

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