Display brightness in the power manager is lower then the actual Windows settings

Hello together,
i have a problem withe the brightness settings of my w520.
Ich have configured a brightness of 5 in the powermanager. when i apply these setting, the brightness is set to 7. what ever i configure, this value is always higher by 2. the higher value is the same as the value in the windows system settings. reinstalling the powermanager and the graphics driver don't help. has anybody an idea? is there a registry key for this?
i hope you can help me, because its pretty annoying!
Thank a lot and have a nice day :-)
with kind regards
Lekanter

Does it work normally if you use the Fn+Home/Fn+End keys?
W520: i7-2720QM, Q2000M at 1080/688/1376, 21GB RAM, 500GB + 750GB HDD, FHD screen
X61T: L7500, 3GB RAM, 500GB HDD, XGA screen, Ultrabase
Y3P: 5Y70, 8GB RAM, 256GB SSD, QHD+ screen

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Solved!
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Display brightness in the power manager is lower then the actual Windows settings

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