[ubuntu] Lenovo G580 Volume & Brightness

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http://ubuntuforums.org – Hi, I own a Lenovo G580 laptop. I'm having Ubuntu 13.10 installed in it with Windows 7 on dual boot. My problem is that in Ubuntu, I'm not able to change the brightness. The brightness stay as it is eventhough I can see in the notification window the value changes. Regarding volume, I can control volume but the sound output is very low in Ubuntu compared to Windows. Please help if anybody has any solution for it. I really like to continue on Ubuntu. Regards, Adarsh (Hardware)