I purchased a new Lenovo g580 laptop. But I am totally disappointed when I installed Ubuntu on it. Almost all drivers are not working. :-( The laptop configuration is intel i3 processor Nvidia GeForce 610M graphics card. I couldn't find the nvidia drivers in the additional drivers (jockey). The main problem is that the brightness control not working. I tried lots of methods explained in this site, but the result again disappointed me. I am a student and I am using Linux, and the brightness control is the most urgent problem that have to be solved. So experts please give me a solution. thanks in advance