After having to do a reset to Windows 8, I reinstalled all available drivers on the support page for my Alienware M17 R4. However, I still have one "unknown device". The action center on Windows 8 is giving me this message:

Solve a problem with COMPAL Embedded System Control

COMPAL Embedded System Control is missing a driver.

To find out if a solution or an updated version of COMPAL Embedded System Control is available, go online to your PC manufacturer’s website.