27-Inch iMac Firmware Updates Address High Processor Usage, Display Backlight, and Target Display Mode Issues

172839 imac star trek

Apple today continues its barrage of updates with the release of a pair of firmware updates for its 27-inch iMac models addressing a trio of issues.

27-inch iMac EFI FW Update 1.0, weighing in at 2.1 MB and requiring Mac OS X 10.6.3, is recommended for all quad-core 27-inch iMacs and addresses a pair of issues related to high processor usage and display backlighting.

- 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.

The 27-inch iMacs are not the only current Mac models to have experienced problems with processor performance during audio-related tasks, as Apple's Mac Pro line received a software update in mid-February to address its own issues with heat and performance while handling audio-related tasks.

Apple's other firmware release for the 27-inch iMac today, known as 27-inch iMac SMC Firmware Update 1.0, makes unspecified compatibility fixes to Target Display Mode. The feature, currently available only on 27-inch iMacs, allows the machine to be used as a secondary display via its Mini DisplayPort connector. The update weighs in at 397 KB and requires Mac OS X 10.6.3 and the 27-inch iMac EFI Update 1.0 also released today.

Related Roundup: iMac
Buyer's Guide: iMac (Don't Buy)
Related Forum: iMac

Popular Stories

iPhone 14 Purple Lineup Feature

Will the iPhone 14 Be a Disappointment?

Saturday May 21, 2022 9:00 am PDT by
With around four months to go before Apple is expected to unveil the iPhone 14 lineup, the overwhelming majority of rumors related to the new devices so far have focused on the iPhone 14 Pro, rather than the standard iPhone 14 – leading to questions about how different the iPhone 14 will actually be from its predecessor, the iPhone 13. The iPhone 14 Pro and iPhone 14 Pro Max are expected...
iPhone 13 Face ID

'High-End' iPhone 14 Front-Facing Camera to Cost Apple Three Times More

Monday May 23, 2022 7:05 am PDT by
The iPhone 14 will feature a more expensive "high-end" front-facing camera with autofocus, partly made in South Korea for the first time, ET News reports. Apple reportedly ousted a Chinese candidate to choose LG Innotek, a South Korean company, to supply the iPhone 14's front-facing camera alongside Japan's Sharp. The company is said to have originally planned to switch to LG for the iPhone...
iPhone 13 Always On Feature

iPhone 14 Pro Screen Refresh Rate Upgrade Could Allow for Always-On Display

Tuesday May 24, 2022 7:23 am PDT by
Last year's iPhone 13 Pro models were the first of Apple's smartphones to come with 120Hz ProMotion displays, and while the two iPhone 14 Pro models will continue to feature the technology, their screens could well boast expanded refresh rate variability this time round. To bring ProMotion displays to the ‌iPhone 13 Pro models‌, Apple adopted LTPO panel technology with variable refresh...
apple music

Apple Increases Apple Music Subscription Price for Students in Several Countries

Sunday May 22, 2022 1:57 am PDT by
Apple has silently increased the price of its Apple Music subscription for college students in several countries, with the company emailing students informing them their subscription would be slightly increasing in price moving forward. The price change is not widespread and, based on MacRumors' findings, will impact Apple Music student subscribers in but not limited to Australia, the...
EA Apple Maybe Feature

Apple Reportedly Talked With Electronic Arts About Potential Acquisition

Monday May 23, 2022 10:58 am PDT by
Apple is one of several companies that have held talks with Electronic Arts (EA) about a potential purchase, according to a new report from Puck. EA has spoken to several "potential suitors," including Apple, Amazon, and Disney as it looks for a merger arrangement. Apple and the other companies declined to comment, and the status of the talks is not known at this time, but Apple does have an ...
sony headphones 1

Sony's New WH-1000XM5 Headphones vs. Apple's AirPods Max

Friday May 20, 2022 12:18 pm PDT by
Sony this week came out with an updated version of its popular over-ear noise canceling headphones, so we picked up a pair to compare them to the AirPods Max to see which headphones are better and whether it's worth buying the $400 WH-1000XM5 from Sony over Apple's $549 AirPods Max. Subscribe to the MacRumors YouTube channel for more videos. First of all, the AirPods Max win out when it comes ...