No brightness adjustment slider 27" cinema Display

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Level 1

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No brightness adjustment slider 27" cinema Display

In System Preferences -> Display
on 27" display window

There is no Brightness slider in the 27" LED display window
There is no ambient light check box in the 27" LED display window

I am looking forward to be able to adjust the brightness !!!

The configuration:
27" iMac (late 2009)
Mac OSX 10.6.4 installed
LED Cinema Display update V1.0 installed
New 27" cinema display LED connected to the iMac via the Mini DisplayPort

I was previously using a 24" LED Cinema Display before installing the 27" LED Cinema Display (if this can help investigating)

Thanks for your help !

iMac - MacBook Pro 15" - MacBook Air, Mac OS X (10.6.4)

Posted on Oct 20, 2010 1:06 PM

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Answer 1

Oct 20, 2010 2:17 PM in response to ggenet

Just adding myself as another victim of this problem. The monitor is amazing and I love it, just hate that I have to keep rebooting it and that the pinwheel of death is my new best friend.

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Answer 2

Oct 20, 2010 8:22 PM in response to ggenet

New 27" cinema display LED connected to the iMac via the Mini DisplayPort

Is the the display's USB cable plugged into the Mac?

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Answer 3

ggenet Author

Level 1

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Oct 21, 2010 12:26 AM in response to ggenet

USB was not connected ...

Thanks !

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Answer 4

Oct 24, 2010 12:53 PM in response to ggenet

My Cinema Display 27" is too dark. I'm running it in Bootcamp WINDOWS 7. Adjusting "brightness" only provides a "white-wash" look. It has no effect on the actual amount of light coming from the monitor---especially, when I've got it runnning side by side with non-cinema displays attached to the same Mac Pro. It's like there is dark-filter on it. Totally dim by comparison.

I've got a MAC PRO 12 core running bootcamp WIN 7 Pro. Any help please?

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Answer 5

-sa-

Level 1

5 points

Oct 27, 2010 11:14 AM in response to ggenet

This is bizarre. Almost same set up as ggenet.

- Brand new install Snow Leopard 10.6.4
- Mac mini server 2009
- 24" LED display
- connected via mini-display port

Display brightness preference missing! The slider bar is not there. The quick keys on the keyboard do not work either.

Maybe it was the recent Pro Kit or Java update? Aperture update? iTunes 10 or Safari 5?

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Answer 6

-sa-

Level 1

5 points

Oct 27, 2010 11:33 AM in response to ggenet

I reset the SMC and the brightness slider returned.

To reset SMC (formerly known as PRAM). Turn off computer, unplug power cable and all other connections (firewire, usb, ethernet, etc), then hold power button for 10 seconds.

http://support.apple.com/kb/ht3964

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