Actually i have 3 major problems I'll list according to importance :
Couple of information first :
I'm using ubuntu 14.04 64bits on newly purchased Asus SonicMaster s551l with touchscreen , it comes with dual video cards Intel's and nvidia gforce gt 740m (I'm using proprietary drivers).
1- when on battery mode (no charger pluged in) ubuntu keeps freezing every 3 minutes (average) meaning nothing works except sound (mouse doesn't move or click, screen stays still i.e when playing video stays on the same frame), example when i play video on youtube then it freezes the sound keeps playing , until now my solution was to close the laptop led wait a couple of seconds then login and every works as nothing happened .
this is ubuntu only problem cause it doesn't happen in windows i tested before i asked here .
2- Touch screen related issues : i have unity laucher on auto hide but it doesn't show up when i swipe from the sides , plus chrome tabs can't be selected dragged closed (by touching x) or even create new tab by touching the "+" button.
3- Function + bright buttons don't work (only these two) , I can't play with screen brightness using the keyboard (i can still through the setting though) .