The SM Bus is going to be you chipset. You want to get the most current chipset drivers, basically three of the 4 listed under the chipset section. Skip UTIL_WIN_R304257.EXE. Then go back to the APPLICATIONS section and get this one for the sensor ST-MICROELECTRONICS_FREE-FAL_A10_R309372.exe (5MB). This page contains the driver installation download for SM Bus Controller in supported models (Latitude E6520) that are running a supported operating system.
Short for System Management Bus, the SMBus or sm bus controller was first developed by Intel in 1995 as a split from I2C. SMBus requires more strict electrical and protocol conventions and enables your computer motherboard to communicate with low-speed peripherals such as the battery on a laptop computer.
Sm Bus Controller Driver
If SMBus is shown in Device Manager with an error, this is an indication that your motherboard chipset drivers have not been installed or were not found during the Windows installation. See the motherboard drivers page for a listing of links to motherboard drivers and chipset drivers. If this is an OEM computer such as a Dell or HP, we suggest getting the chipset drivers directly from the computer manufacturer website.
Dell Drivers Sm Bus Controller
Bus, Computer acronyms, I2C, Motherboard terms, SBD