This could be helpful.
On Wednesday, Apple released its MacBook Air and MacBook Pro Update 1.0 for its 2012 notebooks. The update, a 76.6 megabyte download, fixes an issue that can lead to increased CPU power consumption, and it improves compatibility with some USB devices.
As always, the update can also be found and installed via Mac OS X’s Software Update feature.
The update requires a 2012 MacBook Air or MacBook Pro notebook and Mac OS X 10.7.4 or later to install and run.
Obviously, this is a significant firmware update, so please let us know how it went for you via feedback in the comments section.