Cannot Adjust Brightness

The Fn down and up keys no longer adjust the screen brightness... the brightness icon and bars appear but it has no effect on the actual brightness of the screen. Setting the power management in the Lenovo energy managment screen also has no effect... I've uninstalled and reinstalled the power management software to no avail.
Any ideas?

Backup your system and restore to default state - does the problem still remain?
edit: gammar fix
Message Edited by skripatch on 02-12-2009 01:33 PM
//help will save the world

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Cannot adjust brightness on win 8.1 x64(i have a WEIRD solution)

macbook pro 13' with retina display
win 8.1 x64
i cannot adjust the screen brightness
i turned off "adjust my screen brightness automatically".
i reinstalled boot camp.
i reinstalled the drivers of intel video card(5100).
the above solutions help nothing.
BUT, at last, i found a WEIRD solution to fix this issue:
1. adjust your screen resolution.
2. select an option of resolution(whatever you want, select an option casually).
3. click "Apply"
4. press ESC(cancel to change screen resolution)
5. now, adjusting screen brightness is AVAILABLE!
now, my question is: HOW TO FINALLY FIX THIS ISSUE?

I had a similar issue when I installed Windows 7 Ultimate 32 bit on my last MacBook Pro. You know how Bootcamp downloads the support drivers for your machine? Those drivers are the instructions for the each component. I messed up a step on installing it and my secondary click wouldn't work, I couldn't adjust the brightness of the screen or keyboard, and I couldn't run games because the drivers didn't install correctly for my machine. You need a USB drive, an iSO Image, a blank DVD or CD with 4GB or more storage, a disk drive with read/write capabilities, and your Mac. If you have a desktop like the iMac or Mac mini, I believe you need a USB mouse and keyboard until the drivers are installed. Follow this video and in it there are two links, one for uTorrent and one for Windows 7 Ultimate 32-bit. If you don't have uTorrent, download it and install from the link. Ignore the link to the Windows 7 32-Bit download. I found a 64-bit version if you'd like or browse the piratebay for windows 8, but I highly suggest a 64-bit version as I believe they can handle more and do more compared to a 32-bit.
Here's a link to the youtube video: https://www.youtube.com/watch?v=PqQmvMCbiwY
Here's a link to Windows 7 Ultimate 64-Bit: http://thepiratebay.se/torrent/6349390/Windows_7_Ultimate_(64_Bit)_Pre_Activated _by_c4rl05.iso
If these don't solve the

Cannot adjust brightness in windows 7 64bit

Hi everyone, thanks for reading!
I cannot adjust the brightness in windows 7 64bit with my keyboard. I have tried reinstalling the latest bootcamp drivers but it still did not work.
The brightness of the monitor is just too bright for my eyes...
Is there anyway I can fix this problem? I really appreciate yr help!
My computer is an mid 2011 27" iMac. It has a i5 CPU, originally 4GB ram but i added another 16GB ram to it.
Thanks for your help again!

is your problem that you can't adjust the brightness from some keyboard shortcut or that you can't adjust it by any means in windows?
I have the same generation imac just 21" model and the apple support hardware video card driver auto adjust the brightness for me if one don't use the apple driver and let windows install some generic amd video card driver that may not be the case
check the amd catalyst display settings for more info also about brightness

Cannot adjust brightness after display driver update on Satellite L855-118

Hi.
I just bought an SATELLITE L855-118 , with ATI graphics today, it was between this and another one, but i know you have problems updating graphic drivers on a Sony-notebooks.
I made a restore point.
So i uninstalled the ATI catalyst and then did an driver sweeper, and re-booted and then installed catalyst 12.6 , installed fine, but my screen went to maximum brightness and i cannot adjust it, the brighness osd appears but the screen brightness does not change.
So i used my restore point.
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Satellite L855-118 - Product Specifications - Toshiba
Thanks
John.

This is not going to help you, but I have details on the internals of brightness control on this machine.
On other notebooks I've worked with, the hotkeys generated an event that was directly handled by the firmware (ACPI) that changed the brightness; this was done to avoid putting into the AMD video driver any system-dependent code.
On the L855 the ACPI does not really handle the notification, it just generates another event that is supposed to be handled by the video driver. For more technical details see:
[http://thread.gmane.org/gmane.comp.video.dri.devel/71255]
Now this is where it gets ugly: if brightness control is indeed system-dependent (e.g. you have to poke some random GPIO) then the AMD driver will never support it (it would have to know the details of each and every model in circulation).
The good news - at least for Linux users - is that AMD just published the specification of its ACPI interface:
[http://thread.gmane.org/gmane.comp.video.dri.devel/71697]
I've already done some experiments with it, keep an eye on the thread.
This may (or may not...) lead to a usable brightness control *for Linux*, but the same information *may* be used to create a similar driver for Windows.

Probook 4540s- cannot adjust brightness

after installing windows 7 i cannot adjust my screen brightness.

You're very welcome.
There are two graphics drivers for your notebook -- AMD or Intel.
Whatever one you installed that gave that error, try installing the other one and see if that one works.
One of them should work.

Cannot adjust brightness windows 8

Hi
Need some help with envy23 I have windowes 8 I cannot adjust the brighness
Please help
Thank you !

hi erin654,
Welcome to the Forums.
It's possible that one of the updates that got installed changed the display driver that controls the brightness functionality
Things that you can try:
1. Press the Windows logo key‌ +R and type devmgmt.msc. On the Device Manager, navigate to the Display Adapter (right click > choose Properties) and on the Driver Tab, check if the Rollback Driver is clickable If it is, do a rollback to restore the previous display driver and try to adjust the brightness
2. Navigate to the Control Panel > Programs and uninstall the display driver and reboot. Navigate to the D:\Drivers folder and locate the AMD Display driver installer or download and run the file below to re-install the display driver.
ATI Catalyst Install Manager (Chipset, AHCI, VGA)
Microsoft Windows 8 (64-bit)
Version: 8.982.7.1
After installing the driver, reboot the machine and try to adjust the brightness.
Alternatively, if you're pressing F11/F12 to adjust the brightness, try to open the ATI Control Manager and adjust the brightness settings there.
Link to picture
Let me know your findings
Regards
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I've connected a 27" LED ACD to my 27" iMac as a second monitor, but the keyboard commands for adjusting brightness do not affect the cinema display. I understand a common cause for this is that the USB isn't connected, but mine is and I can verify it is working because I have an external HD connected to the USB port of the ACD, and the iMac recognizes that it is connected.
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I have an HP Envy 14 Notebook and as of recently, I cannot lower or higher my brightness settings. This laptop has Windows 7 Home Premium installed.
I recently updated my graphics card, or rather, the AMD Catalyst Control Center. Before installing that, the brightness control was working perfectly fine. Afterwards, it just stayed on 100% brightness and its killing my eyes. I tried going in to Control Panel > Device Manager > Monitor > Generic PnP Monitor > Uninstall > Scan for hardware changes, nothing worked. I tried adjusting the brightness level from both AMD CCC and Intel(R) HD Graphics, nothing. I tried booting up in to safe mode, still the brightness settings would not change. As it is right now, because I cannot stand the insanely bright screen I had to go in to CCC > My built-in displays > display color > Contrast to 20. It definitely dimmed the screen by a lot, and I can see a lot better now but my eyes still somewhat hurt from the incredibly bright light. Its a workaround, but I rather have this solved than have a workaround.
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Hi ZeroArmada,
Thank you for visiting the HP Support Forums and Welcome. I have read your thread on your HP ENVY 14 Notebook and getting a blank or black screen on startup. Try performing a hard reset. When performing a hard reset please note remove any and all USB devices, and remove memory cards from the card reader slot. Disconnect all non-essential devices. If that does not help try to turn on the computer you start to press F11 repeatedly till the menu opens. You can do a system restore. Here is a link to a document on how to rollback drivers in the device manager.
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!

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actually it's more than a year, and the warranty already ended.
some technicians told me it might be the battery. Honestly, i have no idea about the PB's battery. Does it comes with one major battery or dual or so on.
Really frustrated now, and wishing a miracle... (

Cannot adjust brightness in new Windows 10 Update

Bravo! This solved the problem with a very dark built-in display and weirdly working brightness F-button on my VAIO VPC Z21 after otherwise smoothly upgrading it to Windows 10 couple of days ago. Thank you!

Hi JacobRocks12!
BuFan is right about the official drivers and software update for Windows 10 operating System. Currently, Sony is testing Vaio computer to the new updates. It takes time since Sony needs to coordinate with certain vendors to validate those updates.
Please visit this page to see the details about Windows 10 update and Upgrade.
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Vincent
If my post answers your question, please mark it as "Accept as Solution"

Have Upgrade Graphic Card Driver, But Still Cannot Adjust Screen Brightness and Sleep Button Not Showing After Clean Installation of Windows 8.1

I have done clean installation of Windows 8.1 on my HP Pavilion G4.
Then I realize that I cannot put my computer on sleep mode and cannot adjust screen brightness.
I understand that those problems caused by the graphic card driver.
My computer is running on AMD Radeon HD 6400 series.
Thus, I manually search on internet and found a latest graphic card update on microsoft site that is claimed compatible on windows 8.1 (link: http://msdn.microsoft.com/en-us/library/windows/apps/dn344644.aspx).
I've upgraded it into the latest one. I've check on Device Manager, the driver is running well.
But my problem did not solved!
Please give me the solution!

Hi,
How about go to Device Manager, then uninstall Graphic driver and restart your computer, system will install its build in graphic drver. You can have a try.
In addition, access to HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Brightness and set its value to 100 for test.
Roger Lu
TechNet Community Support

Cannot adjust display brightness via F-keys nor Preferences

After updating Mavericks to 10.9.4, I cannot adjust the display brightness. Using the F1-2 keys will show the brightness icon that usually pops up. However, it's stuck and nothing happens when I press either F1 or F2 (the brightness keys).
I tried going into Preferences and adjust the brightness from there. "Automatically adjust brightness" is not checked and when I drag the slider, it slides back to where it initially was.
How can I fix this problem?
Thank you in advance,
Filip

Hello Gnazty,
Thanks for using Apple Support Communities.
I'd like you to reset your SMC and PRAM as the articles below describe:
OS X Mavericks: Reset your computer’s PRAM
http://support.apple.com/kb/ph14222
Intel-based Macs: Resetting the System Management Controller (SMC)
http://support.apple.com/kb/HT3964
Take care,
Alex H.

Cannot Adjust Screen Brightness with Fn Keys on New L540 (8.1 x64)

Hello everyone. I just purchased a new L540 with Windows 8.1 x64 on it and have run into a problem I'm seeing is apparently common. While my other Fn keys work as intended, I cannot adjust screen brightness with them. Pressing the buttons just does nothing and the laptop is running at full brightness at all times, even when on the battery. I have installed the latest Power Management Driver and from what I can tell, there is no version of the Power Management Software for anything newer than Windows 7. I also have installed the latest Hotkey driver (in fact, I've installed all the latest drivers for this machine.) I read in another thread that this can be caused by the latest HD Graphics driver from Intel but I actually can't even install that driver (says my system is not supported) so I am still using the latest Lenovo provided driver.
Can anyone please assist with this? I want to be able to quickly adjust screen brightness when on battery but I can't do that at present. Thanks!
Solved!
Go to Solution.

I have the same problem with my L540. It started with the update of the BIOS to version 1.65. Because I didn't find a solution, I went back to BIOS version 1.64, where all the brightness options are there and work properly.
You can download older versions. When on the page with the new drivers (http://support.lenovo.com/en_US/downloads/detail.page?DocID=DS037285) go to BIOS Driver 1.65, then choose "learn more". At the end of the following page you'll see all the older versions.
That you can install version 1.64, you have to change the "Secure RollBack Prevention" Option in the BIOS: Restart the Computer. When you see the option "To interrupt normal startup, press Enter", press Enter. Press once again Enter. Press F1 to enter the BIOS Setup Utility. Choose "Security" -> then "UEFI Bios Update Option" -> then "Secure RollBack Prevention". Change this option to "Disabled". Then press F10 to save configuration changes and exit.
After restarting Windows you can install BIOS 1.64.
Another possibility is to wait for the next BIOS version ....

Cannot Adjust Brightness

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