System policies PopUp on Brightness level

Hi
My first posts in the forum.
Suse was one of my first distros that I played years ago, version 8, but after years I decided to come back, and I'm amazed with the work that as been done not only on openSuse but in KDE.
I'm running it on a PackardBell EasyNote EN TE11BZ , I had some issues with KDE (akanodis and the PIM), but everything look's fine now.

Except this popup to type a root passwd, every time the power manager has to change the brightness or adjust in the login, witch is getting quite annoying.
I guess my user doesn't have the permissions to execute the brightness adjustments. But were can I configure this ?


Thanks