Apple releases 27-inch iMac SMC Firmware Update 1.0 and 27-inch iMac EFI FW Update 1.0

Apple StoreApple today released 27-inch iMac SMC Firmware Update 1.0 which fixes Target Display Mode compatibility issues on 27-inch iMac computers.

Apple today also released 27-inch iMac EFI FW Update 1.0 which is recommended for all quad-core Intel Core i5 and Core i7 processors 27-inch iMacs.

This update addresses the following:
• Resolves an issue that sometimes caused high processor utilization while playing audio through the headphone output mini-jack.
• Resolves an issue that prevented the display backlight from turning on after powering on the iMac.

Note: When your computer restarts a gray screen will appear with a status bar to indicate the progress of the update. Do not disturb or shut off the power on your iMac during this update.

27-inch iMac SMC Firmware Update 1.0 and 27-inch iMac EFI FW Update 1.0 are available via Software Update and also as standalone installers.

More info and download links:
• 27-inch iMac SMC Firmware Update 1.0 – (397 KB)
27-inch iMac EFI FW Update 1.0 – (2.1 MB)

[Thanks to MacDailyNews Reader “Fred Mertz” for the heads up.]

5 Comments

  1. After the update restart, and the grey blank screen appears. your fans will kick on, sounding a bit like winds in the forest… also a bit of dust will fly above your imac from the vents … kinda like pollen. Haven’t noticed any lowering of CPU usage since the update though… guess the audio on mine was fine.

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