I installed Niresh Maverick successfully and everything seems working super...
Intel HD4000 (working with 1024MB VRAM)
Touchpad (working with 2-finger gesture)
Keyboard (working except brightness keys and all other functions key like volume,play,next,previous,mute keys are working...)
Sleep (not Working)
I am using SMBIOS of macbook air 5.2
Dell Inspiron 15 n5521
Intel i5-3337U @ 1.8Ghz~2.7Ghz
Intel HD4000 Graphics
6GB RAM 1600Mhz
Chipset Intel HM76
Please Help Me.....Thanks..