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7020100
(Get the code!)
This affects me, I was able to turn it back at 100% by lowering the brightness bar on the power plug and then taking it to 100% again (when I boot, it's at 100% even though my screen is dim). My graphics card is a "Mobile 945GM/GMS, 943/940GML Express Integrated Graphics Controller". I am attaching the output to the commands you need.