Lenovo g570 - problems after updating intel hd graphics

Hello!
I think i came across a small bug. Don't know for sure which software is to blame, but i think it's the Lenovo Energy Management's  fault. 
I bought a lenovo g570, with intel integrated graphics driver. Installed w7 64 sp1, drivers from DVD. After a while windows update popuped with intel hd graphics new driver. After installing it, the brightness indicator (the thing that pops up when u change the brightness from the keyboard) got stuck at level 2 even if the display brightness was changing.
After 2 days i changed my mind and installed w7 32 sp1  after finding out it was a bit pointless to have it these days when lots of programs are running on 32bits. The same thing happened on this windows. The brightness indicator got stuck.
The mind**bleep** thing (or not) is that after reverting to the old graphics driver, everything was working ok and the brightness indicator got unstucked. 

Same here in Lenovo G 470, I have tried three times installing and rollbacking, but the problem still remains same.
Actually before updating graphic driver if you keep your brightness indicator at 'x' level, then after updation, it will always stuck at the 'x' level, although the brightness is changing.  
But I think it is not a serious issue if everything else is working file, So you could keep your driver updated.

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