Question Can't modify brigthness

[brutzza]

Hi people.
I installed a W7 Pro x64 in an Acer Aspire E5-521
Everything works fine, function keys + F1/2/.../12
But the birightness option doesn't work (Fn + arrows).
Even in contorl panel, battery options, the bright option to move it from left to right to modify the bright, it doesn't appear.
I reisntalled the vga driver from amd catalyst, restarted, and nothing... I even installed a random software that is like an external box to modify the bright but nothing works.
Any suggestions?
Thanks

 

[brutzza]

Solved. Close please. Thanks.

 

[Math Geek]

perhaps you could explain how you fixed it.

others can come along and use your experience to help themselves.

thanks