It seems you haven't installed the system drivers. Please see the guide below. A clean Install of Windows 7 (Pay particular attention to Step 4.) For the SM Bus, you need the Dell Notebook Software, Chipset, Video, Communications and Audio. For the keys you are missing Dell Quickset.
i have dell inspiron n5110 core i5 6gb ram 640 gb hard running on windows 7 professional x64 when i go to device manager >other devices: SM Bus Controller has an exclamation mark next to it i think this means this driver is not installed what does this driver do? and how to install it?   another question: when i press Fn+F4 or F5 or anything no notification shows up on the screen. how to make it show up? i mean i want that when i press Fn+F4 a a box that has how much brightness there is appears thanks in advance if any1 is expert on this laptop or might know the answers but my writing style isn't good, plz tell me and i will write my question in another way thanks in advance again
need help on SM Bus controller driver plz