Linux On My Samsung

Hi I have three problems only 1 - The problem of multi-touch does not work good 2 - The problem of the brightness does not work 3 - Keys Fn+(F2, F3, F5, F7, F8, F9 , UP+down for brightness) don't work Specifications laptop : samsung R480 intel core i5 M520 2.40GHz Graphic NVIDIA GeForce GT 330M 1Gb ...