24" Display Brightness Control

I have a new 24" Apple display connect to my 15" MBP but have no brightness control. Slim keyboard's F1 & F2 button do not work and there is no brightness slider under the display system preferences.
Running Snow Leopard 10.6.2 all software up to date.
Anyone have any thoughts? Any help or suggestions are obviously welcomed.

Hi guys,
could you kindly verify whether your screen have uniform color?
On my 24" led cinema display I realized that moving a white Word sheet all over the screen, in some areas it is neutral, in other areas (lower right corner) it has a greenish tint.
Has someone else experienced the same problem?
(Please before answering test the issue in the same way I did!).
Thanks for your answers.
Stefano

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Display brightness control not in Prefs Pane

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Display brightness is done via USB. Is the display's USB cable connected to the computer? With older (plasic case) Apple displays, the USB circuitry can fail. This can cause problems with the brightness slider, USB ports on the display, and computer sleep. Unplugging everything from the display for a few minutes may fix it for a while.

Dual 20" Apple Cinema Displays brightness control

Hello all,
Finally added a 2nd 20" Cinema Display to my setup. When I first got the new display hooked up (used from eBay, but in great condition) I noticed that it was pretty dark so I went to adjust the brightness... but the buttons on the side of the display didn't work and there was no brightness slider on the preferences pane for that display. The primary display DID have the brightness control.
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I've been trying to figure out why I couldn't change the brightness on the 20" cinema display connected to my MacBook Pro and now I know the reason. Thanks for this question and answer.
Shouldn't such a simple and necessary thing be made clear in the MacBook Pro manual?

Display brightness control lost

Dear fellow MAC users!
I'm using my 1GHz PowerBook G4 for almost three years now an I never had any problems with the display or ALS, neither under Jaguar, nor under Panther, nor under Tiger.
However, since yesterday I'm not able to change the brightness of my display. The keys "F1" and "F2" simply don't work (and the ALS seems to be turned off, as the keys "F8", "F9" and "F10" don't work either).
At first, yesterday my display was dimmed. After resetting the PMU (Shift-Control-Option-Power) and resetting PRAM and NVRAM (Command-Option-P-R) my display is working at the brightest setting now.
But when I open System preferences/displays then the option to adjust the screen brightness and the box to check whether the screen shall adjust automatically simply are NOT THERE.
I hope strongly that anyone out there has a solution for tnis problem! Are therer any experiences with this issue? Do I simpy have to reinstall Tiger?
Thanks for any suggestions!!
Regards,
Matthias
17" PowerBook G4 1GHz Mac OS X (10.4.7)

I simply re-installed Tiger.
I have to say . . . and obviously I am speaking only for myself . . . since this happens infrequently and is solved by a restart, the payback timewise is about seventeen years.
I'm disappointed that there's no attention to this one by Apple. The "gee, I have a problem, I need to reboot" or "Gee, I need to re-install the OS" is a distinctly Microsoft mentality, and one of the reasons I switched to Apple. It is exactly this kind of little insignificant irritation, multiplied by 50 or so, that makes the difference between the pleasure of using an Apple and the pain of using a Microsoft system. OK, so we've got 49 to go. But I do hope that Apple doesn't slip into the mentality of "Oh, it's just a tiny problem, not worth working on." It's the little things that make the difference.
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Windows 7 "Dim the display" and brightness controls missing

Is this another driver problem? I would think the Nvidia drivers would support this new feature in Windows 7.
http://www.technospot.net/blogs/windows-7-automatically-dim-display-screen/

I suspect you need another driver (not the video card driver) since these function require control of the backlight. It seems Apple does not provide a standard driver that can be used by Windows as the display brightness can only be controlled through Apple's bootcamp drivers in the bootcamp control panel or using the keyboard shortcuts.
Even in Vista, if you go to the Windows mobility centre (Win+X)there should be a panel for display brightness. This panel is missing in bootcamp, suggesting the necessary drivers are missing. This is a shame, but I wouldn't hold my breath for Apple to ever provide these. Then again, I didn't think Apple would ever fix the touchpad drivers for Windows, but they seem to have finally done so in the Bootcamp 3.0 beta drivers, so maybe someday...
Windows 7 also supports automatic brightness changes based on an ambient light sensor, but again, no appropriate driver supplied by Apple...

27" LED Cinema Display, no brightness control

I have a 27" LED Cinema Display that has the Mini DisplayPort cable and I am plugging into a MacbookPro 15" with a thunderbolt port. When I go into System Preferences there is no brightness control or ability to turn off automatic adjustment for the LED display, just the computer. I have the usb port plugged in as well. I have seen previous updates to fix this for earlier versions (10.6) but that didn't work on my OS X 10.8.2. Is there anything to remedy this? The automatic adjustment of brightness is very distracting and I would like to have control of the brightness of my monitor.

FINAL NOTES
It’s possible that the issue might simply be resolved when applying both a Software and a Firmware update for the LED Cinema Display. If you haven’t already, please download and install the following to see if these updates resolve the issue:
http://support.apple.com/kb/DL1338
http://support.apple.com/kb/DL1107
Secondly, if you are using Mac OS X 10.8 (Mountain Lion) or Mac OS X 10.9 (Mavericks), please try this additional Software Update for the LED Cinema Display if you haven’t already installed it:
http://support.apple.com/kb/DL1613
Additionally, my research into other customers’ cases with these issues (brightness controls and USB functions not behaving correctly) regarding the LED Cinema Display shows that the following method might fix your issue: When connecting the affected LED Cinema Display into your Mac Pro, first plug the USB connector into the Mac, then plug the Mini-Display connector into the Mac, and finally re-open System Preferences to see if the brightness controls have returned.
That mentioned just previously is worthless for those with an updated operating system but is mentioned regardless.
As it works out those installers will not allow installation and merely state that you don't need this software in updated systems.
They require that you make a brand new OS installation to be of any effect and are included in Software Updates.
They are worth a try if all else fails.
You should also try Disabling your Bluetooth "Discoverable" setting.
The Discoverable Bluetooth setting seeks to establish a wireless USB connection and depending on your RF environment, can become very busy if not conflicted. (can override a wired USB connection)
Last but certainly not least.
Do NOT connect your monitor USB through a USB hub.
Internally your monitor has a USB hub.
Connecting a USB hub TO a USB hub is just asking, (if not blatantly begging), for problems.

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.

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.

Brightness control no longer working

On some unremarkable occasion several weeks ago, I was suddenly unable to control my display brightness. When I press the keys, I see the overlay, but it will not adjust. Here's where it gets really strange... If I open the display settings and try to drag the slider myself, it glides right back to its original position, which happens to be uncomfortably bright. Enabling auto brightness does nothing except make it "jump" back to its position instead of slide. I made a short video to give you a better idea.
I figured it was probably something I messed up in the system files. Rebooting, resetting SMC did nothing. I even bit the bullet and did a complete factory reset last night, which I really expected to work. Clean install and it's still happening. I'd understand if the keys just stopped working, or if the bars moved and the display didn't change. I just don't understand how its registering the keypress, showing the brightness overlay, but won't move the bar or change the brightness. I've done a lot of searching and haven't found anyone else with the exact same problem. Any ideas?
http://youtu.be/umgLOoouoz8

The function keys started working again a couple of days later. I know I've restarted the iPad a couple of times to see if the keys would start working again and that didn't work so I have no clue what happened.

My screen gets dim and the brightness control buttons don't work

My screen is frequently dim. The brightness control buttons display that they are working, but the brightness doesn't actually change. Any ideas why and what I can do?

Thanks for the suggestion. Actually, I had tried that but still had to go into preferences any time I wanted it brighter. After I posted, I found a thread using some different keywords and found that people were having the same problem with OS versions up to 10.7.2 but solved it with the latest update (10.7.3). I just installed it and now seem to be able to adjust the brightness with my keyboard no problem. I appreciate your reply anyway!

Windows 8.1 update and brightness control

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Hi,
We have set the GP to disable Windows 8.1 update in Windows store, you can check it here:
How to Disable “Update to Windows 8.1 for Free” Notification in Windows 8 Store?
http://www.askvg.com/how-to-disable-update-to-windows-8-1-for-free-notification-in-windows-8-store/
For your second issue, it's not only related to Windows, but also the driver provider. Microsoft is working together with the device manufacturers and partners to deliver update package and try the best to solve the compatible issue and bring a great improvement
on user experience. But you know, it will take some time.
Thanks for your understanding.
Kate Li
TechNet Community Support

20" Cinema dispaly, brightness control w/ PC

I have just purchased the 20" Cinema display to use with a PC. It works and looks great, however the brightness controls and on/off buttons don't work. I read there is a setting to access using Apple Preferences, however I can't figure out using a PC how to ajust or get the buttons to function.
Any help would be greatly appreciated
Thanks very much
Tim

Here you go
This works perfect
http://sourceforge.net/projects/winacd
Mark

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My iMac display is too bright even at it's lowest setting.
A new profile in Display Preferences can't deal with this and the contrast control in Universal Access also doesn't help.
I've tried 3rd party software. Brightness Control continually loses it's setting when the screensaver starts. Shades doesn't work for me because it leaves the pointer undimmed and that small too bright area is right where I need to look. And DarkAdapted is limited by the same screensaver problem as Brightness Control.
I sure wish Apple displays could dim adequately as in the past.
Any suggestions appreciated.

I have DarkAdapted Pro, with registered version, it load your profile at mac os login, and darkadapted its a real bright control, not like brightcontrol (deform colours)...
One question, do you have bright gradient left to right on your mac 24 alu?.. more bright at left side of your monitor, to view this, move one window at the left, and then move it at the right, if you see one variation of white values then the gradient is there!... ok it is my problem and a lot of people are at the same situation like me... not sure if it is a general problem...
Ok see you bye!

AT300 - need help with display brightness

Hello! Help solve the problem with the AT300 tablet.
Balanced consumption charge off, automatic brightness control is also disabled. But when watching videos, surfing and gaming brightness still varies depending on the color of the image. If the image is dark, the brightness decreases, if the picture is brighter - the screen gets brighter. How do to fix the brightness?
Thanks!

Hello,
I have the same problem like flash85.
When I scroll down on bright websites and a darker picture is shown on the screen,
the whole display becomes much darker and even the colors on the screen change.
Yesterday I've tried the same website on an IPad and the background and colors perfectly
stays the same.
Also the display permanently dimms down or up if the automatic brightness control is
enabled. This is also very disturbing.
I can't imagine that this behaviour is normal. I read many tests before and none of it mentioned this.

Brightness control problem after returning from Stand By - T500

Hi,
I have a Lenovo ThinkPad T500 under Windows XP SP2.
In Power Manager, I have created a custom power management scheme and set the brightness to 80%. This works fine when I boot up the machine, but when I return from Stand By mode (sleep) the machine automatically sets the brightness to 100%. I will then have to use to brightness control buttons to set it back to 80%. This is very annoying and obviously a bug.
I have the latest BIOS and Power Manager version installed.
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I found your post after searching as I hae the exact problem you describe - I turn off the screen using Fn F3 and later when I wake the display the brightness jumps to 100% and I cannot get it to turn down to any level. It's stuck at 100%. Yup, just tried closing-n-opening the lid the screen goes to my previously set brightness level.
my drivers are current as at 2010-03-26 (today)
Running a downgraded XP W500 model...
a bug for sure!
Rick
W500 4058-CTO WinXP

Display brightness 10.10.2

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I have noticed my computer doing this, especially when the window I have open is mostly white. All I do it tip the screen back a tiny bit, and it stops fluctuating.
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Message was edited by: Kelly Gould

24" Display Brightness Control

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