Brightness controls disabled after Monitor OFF-ON cycle

So this has been a weird problem on my T400 with discrete graphics. I frequently turn my monitor off on battery. Hoever, once I resume it, the brightness control ceases to function. I can see the OSD but there is no control. Also the monitor resumes with lowest brightness. I have power manager I and started noticing the problem after the update.
- The only remedy i have so far is a full restart.
System
T400 8600
3 GB Ram
Discrete Graphics
Windows xp Pro.

Based on cycle count and capacity your battery is in great shape. You might check the adapter and port for debris, and try an SMC reset:
http://support.apple.com/kb/HT1411
Only Apple can determine whether you qualify for a free replacement - they have a battery tester which they'll use if you bring your MBP into an Apple Store.

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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.
Can someone offer a solution please?

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

Brightness control issues after update

after updating nvidia driver even with brightness control enabled in the xorg.conf file I cannot adjust brightness. and using the driver control panel I cannot adjust brightness, hue, or saturation under the Xserver Xvideo correction tab.

The cross-posting was a mistake on my part. I thought the post didn't submit rather than being moved.
I have a 680 gtx mobile card in an system 76 gazp6.
The issues I found were irreverent or were resolved by enabling brightness control in the xorg file
This happen after an update to the driver and the xorg file becoming corrupted.
it was rebuild with nvidia built in tool.
# nvidia-xconfig: X configuration file generated by #nvidia-xconfig
# nvidia-xconfig: version 295.53 ([email protected]) Sat May 12 00:34:20 PDT 2012
Section "ServerLayout"
Identifier "Layout0"
Screen 0 "Screen0" 0 0
InputDevice "Keyboard0" "CoreKeyboard"
InputDevice "Mouse0" "CorePointer"
EndSection
Section "Files"
EndSection
Section "InputDevice"
# generated from default
Identifier "Mouse0"
Driver "mouse"
Option "Protocol" "auto"
Option "Device" "/dev/psaux"
Option "Emulate3Buttons" "no"
Option "ZAxisMapping" "4 5"
EndSection
Section "InputDevice"
# generated from default
Identifier "Keyboard0"
Driver "kbd"
EndSection
Section "Monitor"
Identifier "Monitor0"
VendorName "Unknown"
ModelName "Unknown"
HorizSync 28.0 - 33.0
VertRefresh 43.0 - 72.0
Option "DPMS" "0"
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Section "Device"
Identifier "Device0"
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EndSection
Section "Screen"
Identifier "Screen0"
Device "Device0"
Monitor "Monitor0"
DefaultDepth 24
Option "NoLogo" "1"
Option "DamageEvents" "1"
SubSection "Display"
Depth 24
EndSubSection
EndSection

T440S OSD Brightness control failure after resume from Sleep

Hi,
I have owned a T440S since late 2013.
Relevant Details:
T440S
Model : 20AQCTO1WW
OS : Windows 7 professional (original installation by Lenovo)
Latest Drivers installed as of June 2014 - including HotKey and Power Management
HotKey ver : 8.30
Power Managment : 6.65.1
Since receiving this laptop, OSD birightness control has always failed to work, i.e. does not appear on the screen
when using the Fn+F5/F6 key combination nor does it control actual screen brightness AFTER FIRST resuming from sleep
mode.
Sequence of steps that demonstrates the above symptom:
1. OSD brightness works fine after reboot
2. Putting the machine to sleep (I do not use hibernate) for a duration longer than a few minutes
3. Open lid the first time, hit Fn to resume machine
4. Pressing Fn+F5/F6 key combo does not display the brightness slider nor does it control brightness
5. Closing the lid and opening it again, causes OSD brightness slider to flash brifely and is now fully functional
using Fn+F5/F6 keys
Your tech department should easily be able to re-create this issue on any stock T440S/Win7pro machine, as
I have seen others comment about this very issue across other T440/OS variants.
This very same behavior has been there since the beginning.
When is Lenovo going to FINALLY FIX IT ONCE AND FOR ALL?
Thx,
--Alon
Solved!
Go to Solution.

Try this hotfix:
https://support.microsoft.com/kb/2752407
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Hello all.
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I was having the same problem after I completely tore down my Macbook Pro mid-2010 in order to replace the keyboard. (Phew!) After re-asssembling, everything was working again except for the screen brightness buttons (F1,F2). I figured it was a bad keyboard, but after zapping the p-ram, the brightness buttons now work as they should. Thanks for the tip!

Brightness control not working after sleep

Sometimes, after I close the lid for some time and then open the lid again (putting the computer to sleep?) the screen is very dim and the brightness controls don't work. Solution seems to be rebooting the computer. Apparently this problem has been around for a long time:
2009 https://discussions.apple.com/thread/1147601?start=0&tstart=0
2007 https://discussions.apple.com/thread/1119174?start=0&tstart=0
I'm on a (nearly) brand new five-thousand dollar MacBook Pro with the latest OS (Lion?) with all the software and firmware updates, and the laptop has been rebuilt twice by the genius bar at the Apple store due to a faulty solid state disk drive and a subsequent disk corruption issue. And, let me just throw in for any Apple engineers who might be listening, that if I close the lid (sleep?) when my laptop is fully charged, it will be dead, or nearly dead by the next day. I've got an $800 two year old Asus that I closed the lid on and came back to weeks later and it still had nearly a full charge (I opened it up and went right on working for a couple of hours). Very disappointing for a $5,000 computer! But I digress...
I'm sure the battery situation is hopeless, but is there any hope for a resolution to the brightness control?
And let me just say that I very much appreciate all the hard work and helpfullness of the good folks at the Apple store and on this forum. It's not your fault this $5,000 machine has such aggrivating shortcomings. It's like buying a Ferarri (yes, I admit...it's a Ferarri) with a door that won't open and windshield wipers that don't work. And you know what's worse is those TV commercials where the Mac's are smugly portrayed as such superior machines...OK, sorry...I'll stop.
Off to reboot so I can see the screen...any help would be appreciated.

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...
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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.
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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?
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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...
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Click device manager (lop left of window)
Expand Monitors section
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Hi All,
I have a late year 2010 MBA core2duo with 4GB of ram, and I was running Windows 7 for a long time and recently bought a Windows 8 upgrade key. I heard the boot camp drivers were updated so I decided to load it up. I installed the new boot camp drivers on the Windows 7 side before the upgrade (had to use the command line to do the driver upgrade).
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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...
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I am running windows 7 x64 Ulti on a 15" rMBP.
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hey cbolos,
check via http://support.lenovo.com and see that your Power Management software is at its latest version. If not, download and install.
if it is the latest, uninstall all UltraNav drivers+Utilities and the Power Management.
let window install its generic drivers. Test and see if it happens again
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HT4293 I have an Apple monitor model A1316 is using for Windows computer, but I could not adjust the brightness. The monitor is not bright enough when I turned off the lights in my room.

I have an Apple monitor model A1316 is using for Windows computer, but I could not adjust the brightness. The monitor is not bright enough when I turned off the lights in my room.

Have you plugged the USB cable into the computer also as the brightness is controlled over USB. If this does not work, you would need the Apple Display Driver for the version of Windows that you are using. The display driver is part of BootCamp software that you may be able to find online

2 monitor brightness control non-existant?

New Mac Pro and new second 23" monitor.
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Is the "Disable Brightness buttons" box unticked in the Display preferences/options window? You may need to do it separately for each monitor.

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HT202856 Can keyboard brightness controls be mapped for a 4K monitor on the Thunderbolt port?

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Brightness controls disabled after Monitor OFF-ON cycle

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