Hi MalD0n, thankyou so much for the quick revert and giving your precious time,
I used the edited DSDT and brightness slider started working but only by going to display settings, no F3,F4 keys for brightness, also the battery is still not showing up, i have used virtualsmc and its plugins for battery and brightness. Thanks again , you're a GEM.
o oh, i replied early, i should first try the useful links of your sig, thanks, will let you know if i dont succeed