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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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.
Does anyone know what might be causing this? Any help would be greatly appreciated.

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?

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.

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

Hey Admin(Karl) Still have brightness control problem w/dual ACDs on G5

Can someone on the administrator or tech 3 or 4 guru level from Apple Please tell me what I need to do to access the brightness controls of my two previous generation "clear with/ white frame" apple 23" cinema displays ? I posted here two weeks ago - had no responses.
Went to AppleCare via phone for an hour - Indian person trying to help said it is available in the monitors prefs tabs/and monitor pull down menu on the menu bar next to the time ( nothing but resolution/arrangement/color profile there ).
I have since re-installed 10.4 from the original disks AND upgraded to 10.4.3 - Hoping that something would change. Nothing did.
Nothing shows up on screen when pushing the brightness buttonon either monitor, OR when I go to the monitors control panel - no brightness slider or tab on top.
It is driving me crazy to have to review my work ( digital photography ) on my old G4 system to be able to judge the proper density of the images.
I can profile the pair with a Spyder2 calibrater, and load the profiles fine, but again brightness is the issue, not the color. One of the displays is about 30% brighter than the other, and there in lies my problem.
Since the same difference in the screens is the same across various applications ( Final Cut Pro / Adobe PS / DVD player ), can I assume that this is a system issue software issue ?
Am I the only one having this problem ? Or is there just a glitch that no one has managed to tackle and fix even this far into Tiger ?
Please someone reply and save my sanity !
Mel
NEW Powermac G5 2.3 w/ dual port stock video card Mac OS X (10.4)

Hi Mel,
Sorry to hear that you are having problems.
I feel I have to point out that most of the 3 or 4 level Gurus don't actually work for Mac. We tend to obtain our knowledge from our own experiences plus sharing other peoples' experiences in this forum.
The reason I haven't responded to your issue myself is because I have no first hand experience of your problem, and I haven't been able to find anybody else who has had this problem and has been able to fix it. I'm always reluctant to respond unless I feel I have some information that will really help (or, at least, not possibly make things worse).
Anecdotally, this issue appears to have surfaced with the release of Tiger, so it may well be a software issue.
I don't know how old your G5 is - will it function with Panther? If that is the case, then installing Panther on another drive or partition (i.e. keep Tiger for now), and then booting up with Panther may give you an interim solution while the issue (hopefully) gets resolved in Tiger.
The fact that the brightness options are not available probably means that the drivers bundled with the Tiger installation for the graphics card that is in your G5 do not support the displays you are using properly. I believe that the stock video card you are using is an ATI card (you might want to check this via system profiler). At this stage, it would certainly be worth your while to contact ATI support and see whether they have drivers available that will assist you. This link may help get you started:
http://www.ati.com/products/mac.html
I acknowledge that I haven't really given you a solution, and I apologize for that. Hopefully, what I have given you will give your quest some direction.
Please let us know how you fared. All the best.
Cheers!
Karl

Locking Brightness Controls

There used to be a function to lock the brightness controls on a cinema display so they can't be changed accidentally after calibrating the display. But I can't remember where they are. I looked in System Preferences, in the calibration software and in Coctail, without luck. Can anyone here help me with that?
Thanks.

You could unplug the display's USB cable and tape a cover over the display's brightness buttons.

Windows 8.1 kills screen brightness control

I have a touch smart 23 computer that came with windows 8.0. An auto upgrade to 8.1 caused the screen brightness control to stop working and the screen stays on super bright. I could not get a response on how to fix so I had to re-install 8.0 which fixed the problem. I set the system to not upgrade without my approval and yet it did it again last week (about 4 or 5 months later). When I have to reinstall 8.0, I have to re-install several primary programs as there are no restore points left except back to factory settings. Question one is - has there been a fix installed on windows 8.1 that will again let me control the brightness on my screen? If not, question 2 is how did the update override my setting to not allow updates to install without my approval. I have a full day of re-installs that I don't want to have to do a third time.

Hi:
You probably have to install the W8.1 graphics driver for your specific model.
Normally when you can't control the screen brightness, that means the graphics driver isn't installed.
As for your second question, that I do not know.

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!

My screen brightness control buttons don't work windows 8

my screen brightness control buttons don't work?
the light in the mute button is always on when NOT on mute?
Have set up Win8 3 TIMES but get always same bug agan
Hope someone can help

Hello smarisig. I understand you are not able to control screen brightness from the keyboard on Windows 8. By chance, did you upgrade to Windows 8 from Windows 7? I have located an online forum that contains troubleshooting on this issue: http://thedailybuggle.com/forum/unable-control-screen-brightness-windows-8-a-200.html
The person who posted the issue on this forum had upgraded from Windows 7 to Windows 8, and then this issue occurred. That is the reason I asked if this Windows 8 was upgraded. Regardless, follow the troubleshooting presented and it could resolve the issue for you. If not, let me know and I will continue to research the issue in the meantime. I'm only here to help!
Mario
I worked on behalf of HP.

Satellite C650-I5011 - Brightness control is not working

Hi,
I have a Toshiba C650 - I5011 model with Ubuntu 10.3 . I have a problem that even after pressing the Fn + F6 key, the brightness of my LCD does'nt change.
It remains at maximum.
I have installed both Toshutils and hotkey daemon. My volume control key (on numeric alternate) works perfectly fine but none of the Function keys work. Pls help.
Also, I had errors during installation of Ubuntu on my laptop because of which I had to permanently disable ACPI, else it won't boot. Following is the lspci output :
00:00.0 Host bridge: Intel Corporation Core Processor DRAM Controller (rev 02)
00:02.0 VGA compatible controller: Intel Corporation Core Processor Integrated Graphics Controller (rev 02)
00:16.0 Communication controller: Intel Corporation 5 Series/3400 Series Chipset HECI Controller (rev 06)
00:1a.0 USB Controller: Intel Corporation 5 Series/3400 Series Chipset USB2 Enhanced Host Controller (rev 05)
00:1b.0 Audio device: Intel Corporation 5 Series/3400 Series Chipset High Definition Audio (rev 05)
00:1c.0 PCI bridge: Intel Corporation 5 Series/3400 Series Chipset PCI Express Root Port 1 (rev 05)
00:1c.1 PCI bridge: Intel Corporation 5 Series/3400 Series Chipset PCI Express Root Port 2 (rev 05)
00:1c.4 PCI bridge: Intel Corporation 5 Series/3400 Series Chipset PCI Express Root Port 5 (rev 05)
00:1d.0 USB Controller: Intel Corporation 5 Series/3400 Series Chipset USB2 Enhanced Host Controller (rev 05)
00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev a5)
00:1f.0 ISA bridge: Intel Corporation Mobile 5 Series Chipset LPC Interface Controller (rev 05)
00:1f.2 SATA controller: Intel Corporation 5 Series/3400 Series Chipset 4 port SATA AHCI Controller (rev 05)
00:1f.3 SMBus: Intel Corporation 5 Series/3400 Series Chipset SMBus Controller (rev 05)
00:1f.6 Signal processing controller: Intel Corporation 5 Series/3400 Series Chipset Thermal Subsystem (rev 05)
01:00.0 Ethernet controller: Atheros Communications AR8152 v1.1 Fast Ethernet (rev c1)
02:00.0 Network controller: Atheros Communications Inc. AR9285 Wireless Network Adapter (PCI-Express) (rev 01)

Hello,
The backlight detection depends from acpi options selection on your kernel. Which kernel version do you use ?
$ uname -a
(Use at least a 2.6.36 kernel since a lot of improvement for recent Toshiba laptop have been done during summer 2010)
This done, ACPI options beeing compiled into kernel or loaded as module, this line should appear in your /var/log/Xorg.0.log :
"found backlight control interface /sys/class/backlight/acpi_video0"
Having a C650-15Z, my brightness control works well.
regards,
alex

Windows 8.1 update and brightness control

I have a DELL XPS L521X with Windows 8.1 (I had windows 8 some days ago) and I have had two problems:
1) I did not allow Windows to upgrade to 8.1 and it forced me to do it. It gave me 15 minutes to save progress and do it. I was watching the NBA finals on my computer and it was the only thing I had to watch the game. The installation lasted the whole second
half the game and I WAS NOT ABLE TO WATCH IT DUE TO THIS, YOU CAN IMAGINE HOW I AM FEELING ABOUT NOT USING WINDOWS EVER AGAIN... How can I prevent it from ever upgrading anything without my consent? I had already turned off updates from Control Panel\System
and Security\Windows Update but it didn't help.
2) My brightness control became broken after the 8.1 update. I had to manually pick the older Intel HD 4000 driver to have it working again or else my eyes would stop functioning after such a bright display. I had to switch to the 9.17 driver version from
September 2012. Where can I get the lastest WORKING version of the driver?
Please stop making me loose days fixing Windows issues...

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

Brightness control not working in Windows 8 x64 after sleep with Boot Camp 5.0.2

Hi,
I am using Boot Camp 5.0.2 with Windows 8 x64.
Wheen the computer has been in sleep mode, and wakes up again, the brightness control won't work as expected.
Usually the screen is to dark (darker than before, what it should be), and after some time pops up brighter as it should be.
Has onyone else seen this issue?
I mean, it seems that for brightness we use the internal control GUI of Windows 8, and not the Apple one that is used in Windows 7 and in Windows 8 for the sound control.
Macbook Pro 13" Retina, early 2013 (brand new) with 8GB RAM and 512GB SSD and 3.0GHz i7.

I have been having the issue of no brighness control when running windows through bootcamp for about 6 months now and have not found any applicable solution online.
While messing around trying to figure it out yet again I noticed that my monitor driver was signed by team viewer...
Sure enough clicking the roll driver back button resolved the issue by rolling the driver back to the Microsoft driver...
So long story short:
Right click "My Computer" click properties
Click device manager (lop left of window)
Expand Monitors section
Double Click monitor
Click driver tab
If the driver here is not signed by Microsot or Apple click the roll back button. My driver version is 6.1.7600.16385 (Driver date 6/21/2006)
Rolling this back instantly resolved my issue. I will now propagate this post to all the threads I saw regarding this issue.
I am running windows 7 x64 Ulti on a 15" rMBP.
Best of luck

No screen brightness control on an envy 17

I had some maleware that was removed and it broke the Catalyst Control Center, I only has the Intel 300 HD to view the screen from.
I used the 14-4-mobility-win7-win8-win8.1-64-dd-ccc-whql from 3D GuRu
and,
win64_152822 intel hd 3000 from the intel site.
I have the popup omn the screen from the keyboard shortcut, but nothing haoppens. its on full brightness.
Left click the battery icon in the tray and there is a place for 'Adjust Screen Brightness'. It takes me to a page 'Select A Power Plan' where it SHOULD be but doesn't show up. If I select 'Change Plan Settings' it is there but has no effect. its all still full bright.
It was working fine until the malware.
Did sfc /scannow, nothing to report.
Any ideas on this?
FJW
Envy 17-3090NR 3D NON drivers
14-4-mobility-win7-win8-win8.1-64-dd-ccc-whql
win64_152822 intel hd 3000

Hi @fjward ,
Thank you for visiting the HP Support Forums and Welcome. I have looked into your issue HP ENVY 17-3090nr 3D Edition Notebook PC and issues with brightness control and the Catalyst Control Center. I would uninstall any graphic drivers that are listed and CCC software, restart the computer, then reinstall only the AMD. It will include the Amd Graphics Driver and Catalyst Control Center restart the computer.
Here is a link to the HP Support Assistant if you need it. Just download and run the application and it will help with the software and drivers on your system.
You can do a system restore. System restore will help if something automatically updated and did not go well on the Notebook.
When performing a System restore please note remove any and all USB devices. Disconnect all non-essential devices as they can cause issues.
Please let me know how this goes.
Thanks.
Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
Click the “Kudos, Thumbs Up" on the bottom to say “Thanks” for helping!

IMac G5 (iSight) with 10.4.11: Screen always dimmed. Starts at full bright and a second later dimms and stays like that forever. Brightness controls work normally under this circunstance. Please help !!!

iMac G5 (iSight) with 10.4.11: Screen always dimmed. Starts at full bright and a second later dimms and stays like that forever. Brightness controls work normally under this circunstance. Please help !!!
Please don't tell me to adjust anything on the preferences, since I have tried all. I think it may be anoter kind of problem, maybe hardware related or anything.
I ran the Hardware repair DVD and everything was ok, but when the imac restarted the screen was very lit again, but when it went sleep, when it went awake again the screen got dimmed again. Because of that I think that the problem could be software related, but who knows. Excuse my english.

I can't see another possible answer - the longer your machine is up, the more the power supply is stressed, it protects itself by dimming the screen to lower the draw on it.

20" Cinema dispaly, brightness control w/ PC

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