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苹果订单编号为MC007LL/A / 27" 2560x1440 分辨率的显示器。

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Bightness control no longer working

Some time ago I've sent my Cinema Display to repair under warranty. But after that, the brightness control of the display is missing from the display settings.

I think they may have forgotten to connect something inside the display. So, I'd like to know which connections I should check for it.

Note: the USB cable of the display is properly connected to the computer and the audio is working fine. The video is also working fine, but only with full brightness.

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I resolved this issue and am posting fix in case anyone is using the Gefen DL-DVI to MDP with the same combniation. The EDID Mode on the device which prior to 10.8 could be set as the Gefen manual instructs (pg 9 of http://www.gefen.com/pdf/gtv-dvidl-2-mdp...) to EDID Mode 2 (Apple 27") needs to be set instead to EDID Mode 3 (EDID Pass-Through) the brightness control returns without even a restart of any of the three devices -- when this is first done my Cinema screen defaulted 1920x1140 (intead of the full-screen 2560x1440 coming through on Mode 2) so this must be reset under Display Prefrences after switching.

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Pedro Celestin 将永远感激不已
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