27" Cinema Display - No Brightness Control

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Level 1

11 points

27" Cinema Display - No Brightness Control

I have read over all the threads here and the internet. I have an iMac (black back) that my 27" Cinema display is connected to. USB and Displayport are both connected. Everything appears just fine. However, I cannot adjust the brightness on the Cinema display. I have tried everything. I even hooked it up to my Macbook Pro early 2011 model. Still the same issue. There is no brightness slider. The slider only appears for the native display only. Never the Cinema display. What am I missing?

Running Lion on both machines.

Posted on Dec 8, 2011 3:21 PM

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Answer 1

X423424X

Level 6

14,265 points

Dec 8, 2011 6:26 PM in response to SpurtSpanker

Couple of thoughts:

1. Is the USB cable connected?

2. Have you tries a smc reset?

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Answer 2

SpurtSpanker Author

Level 1

11 points

Dec 9, 2011 2:40 PM in response to X423424X

USB cable is connected. It's not an SMC issue. I have tried this on 3 iMac's and 1 2011 MacBook Pro. Same issue on all machines. Cinema display does NOT have brightness control. Only the native screen.

Tried on OSX Lion 10.7 and Snow Leopard 10.6. Tried loading the 1.0 Cinema display firmware update. Won't install on Lion and states it's not require on Snow Leopard 10.6.

Any other suggestions out there? The display is full brightness it seems and it's annoying as crap.

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Answer 3

SpurtSpanker Author

Level 1

11 points

Dec 12, 2011 12:46 PM in response to SpurtSpanker

Called Apple support and they told me to take it in for repair. They had no solution for me.

After digging around and talking to a friend, we came up with a solution to this. The EDID reset tool. Ran the tool, power cycled the monitor and there it was - brightness slider control.

So there you have it. If you're having this problem, try resetting the EDID of the monitor.

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Answer 4

X423424X

Level 6

14,265 points

Dec 12, 2011 1:09 PM in response to SpurtSpanker

Where did that EDID reset tool come from (link)?

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Answer 5

SpurtSpanker Author

Level 1

11 points

Dec 12, 2011 2:52 PM in response to X423424X

I'll post a link when I get home.

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Answer 6

SpurtSpanker Author

Level 1

11 points

Dec 13, 2011 10:09 AM in response to SpurtSpanker

Here you all go-

http://download.info.apple.com/Apple_Hardware_Test/EDID_Reset_Tool.dmg

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Answer 7

X423424X

Level 6

14,265 points

Dec 13, 2011 1:03 PM in response to SpurtSpanker

Thanks.

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Answer 8

ascphoto

Level 1

0 points

Feb 7, 2012 10:21 AM in response to X423424X

Just used it too after similar problems and its worked! 🙂

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Answer 9

DavidMH

Level 1

0 points

Feb 27, 2012 2:50 PM in response to ascphoto

One might also trying this: Plug in the USB cable to the laptop as well as the video plug. Worked for me, and Apple came up with the solution.

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Answer 10

socratis

Level 1

0 points

Apr 21, 2012 11:17 AM in response to DavidMH

i have the same problem but i have 24-inch led cinema display not 27 and i cant find EDID reset tool for cinema display 24-inch.. do you know if there is? Thank you!

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Answer 11

Apr 27, 2012 7:30 PM in response to SpurtSpanker

Thank you! Thank you! Thank you! I just spent 2 hours looking for a solution before I found this thread. SpurtSpanker you rock! Used the tool and it worked! 🙂

Cheers!

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Answer 12

May 9, 2012 4:05 AM in response to SpurtSpanker

A big thanks from me too. I like my display pretty bright so was disappointed not to be able to do this on my new Apple 27". Now I can and it looks much better.

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Answer 13

Aug 2, 2012 10:45 AM in response to SpurtSpanker

I had the same issue after a Apple repair and the EDID reset tool fixed everything back to normal for me too - Thanks a ton!

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Answer 14

I am N8

Level 1

20 points

Aug 27, 2012 3:28 PM in response to SpurtSpanker

Worked like a charm!! Been dealing with no brightness adjutments for months. Thank you !!!

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Answer 15

Aug 28, 2012 10:11 PM in response to SpurtSpanker

I downloaded the EDID Reset Tool for my 27" Cinema Led Display and the instruction tells me to "Connect LED Cinema Display (27-inch) to begin. However, the display is already connected. I've restarted. I've started without the display connected and then connected it, but I can't get that instruction to go away and the "reset EDID" is pale grey and can't be activated.

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