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Thursday, 27 December 2012


That is the case even if the display is primary, not secondary. For whatever reason, Apple does display control over USB instead of DDC.

This helped me. Thank you Mike!


> if you want fine control...push the Shift & Option keys

Brilliant! (pun intended). Works for volume too.


Does holding ctrl-F1 or ctrl-F2 not adjust the brightness on the other display?

[No. Just the main display. --Mike]

The need for a USB cable has existed for many generations of the Apple display. My 20" Apple Cinema Display (purchased new in 2006) requires USB to control brightness.

[Curious, then, that a full-time independent Apple tech/repairman, two Apple phone tech support people, and one tech support supervisor with seven years' experience still didn't know it.... --Mike]

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