A note on the Support / Downloads section of Apple’s web site says that the LED Cinema Display Software Update 1.0 provides support for the 27-inch LED Cinema Display.
For more information about the update, Apple directs customers to a knowledge base article where it explains that this software updates the System Preferences pane where customers can change Ambient Light Sensor settings.
To do this, users must enable the option "Automatically adjust brightness as ambient light changes" to turn the ambient light sensor on and off. A slider is there so that customers can adjust the brightness level to suit their needs.
“Additionally, this software update includes a modification to Sound preferences pane that will allow you to select the LED Cinema display as your audio output,” Apple notes. “You can also control the left and right balance using the slider,” the Mac maker adds, and posts relevant imagery as an example.
Checking with Apple’s Support document HT4293 is important, as it includes the proper instructions for installing this software update.
Updates such as these - adding support for new hardware - must be done exactly as instructed, otherwise there will be compatibility issues. The instructions are provided as follows.
(The downloadable LED Cinema Display Software Update 1.0 can be found at the bottom of this article)
1. Connect your Mac to your LED Cinema Display (27-inch).
2. Your computer and display power cords must be connected and plugged into a working power source.
3. Save all open documents and quit all other applications.
4. Download the update.
5. If you downloaded the disk image using Safari, Safari will notify you that an application is in the image. Click OK to continue.
6. The downloader will place the disk image with an installer in your Downloads folder or in the location specified in the General tab under Safari > Preferences.
7. If "Open safe files after downloading" is enabled in Safari preferences, the disk image file will mount by itself. If that preference is not enabled in Safari, double-click the disk image to mount it.
8. Double-click LEDCinemaDisplaySoftwareUpdate1.0.pkg.
9. Click Continue.
10. A license agreement appears. Click Continue to proceed.
11. Click Agree to accept the terms of the license agreement.
12. Select a destination to install the software. The destination will be highlighted by a green arrow. Click Continue.
13. To install the software, click Install.
14. Enter the computer administrator's password and click OK.
15. A dialog appears, indicating that this software will require a restart to complete the installation process. Click Continue Installation.
16. An "Installation was successful" dialog appears. Click Restart.
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