Apple today released a software update for Boot Camp for the 13-inch MacBooks Pro released last month. The update solves a problem related to the brightness adjustment of the screen and a bug that can leave the machine without sound, with headphones connected.
This update will be offered automatically to users when they start Windows, via Software Update (Software Update) is offered with the installation of the drivers. In addition, it is also available on the Apple website, in separate versions for the 32-bit (1.5MB) and 64-bit (1.03MB) editions of Windows.
After the update, be sure to check if the drivers have been updated. This support article offers detailed instructions for this.