MacBook Air (Mid 2011)
Apple released MacBook Air EFI Firmware Update 2.9 Monday for MacBook Air (Mid 2011). The update addresses an issue with sleep.
Apple's patch notes in full:
This update is recommended for MacBook Air (Mid 2011) models. This update addresses an issue where systems may take longer to wake from sleep than expected and fixes a rare issue that may cause fans to run at full speed after waking from sleep.
The update is a 4.3MB download from Apple's website. You can also download it through Software Update or the Mac App Store on your MacBook Air (Mid 2011).