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[ubuntu] Unable to Adjust Screen Brightness 12.10

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http://ubuntuforums.org – Hello! I have just installed Ubuntu 12.10 on my Acer Aspire One 725 but I cannot seem to adjust my screen brightness and it is stuck on maxmimum draining my battery quickly. I have searched through every thread but nothing seems to work for my specific laptop. I have tried editing my Code: /etc/default/grub as tried in many other threads but it has not worked for me. I might also add that I have tried using both Fn + L and R arrow keys, as well as going to the system settings and adjusting the screen brightness (although after I messed with the /etc/default/grub the brightness slider ha (Hardware)