Unable to change screen brightness

I have an X100E and sometimes when it comes out of sleep I am unable to change the screen brightness. Pressing Fn-Del or Fn-Home just brings up the on-screen brightness indicator but it doesn't change. The only way I've found to be able to change brightness again is to reboot.
It seems that it happens if it goes into sleep when plugged in and comes out on battery, or vice versa, but not always. There doesn't seem to be a correlation to uptime either. I've had it happen after an hour or two up and I've had it happen 7 days up.
I am running Win7 Pro.

Google it a bit and you'll see it is a known issue in Windows 7 with several laptop manufacturers. BIOS will not help in this case. I also have the problem - everytime I hibernate and wake. I have Win7 Pro x64.
Simple workaround I found was to close and reopen the lid (as long as "Close lid" is set to "do nothing" in Power Manager settings. This cycles power on the screen and that somehow resets things until the next time you sleep/hibernate. However, it is strange that cycling the power on the screen using Power Manager "power off display" does not reset it - no effect.
I have my x100 set to:
Power button: Hibernate
Close lid: Nothing
Fn+F4: Sleep

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I see.. thank u for ur reply.
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Cannot change screen brightness on HP pavilion DV6

HI,
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P/N: WY940EA
Please help.

Hello Roma89,
Welcome to the HP Forums, I hope you enjoy your experience! To help you get the most out of the HP Forums I would like to direct your attention to the HP Forums Guide First Time Here? Learn How to Post and More.
I understand that since you upgrade from Windows 7 Home to Windows 7 Ultimate you have been unable to adjust the screen brightness using the Functions keys. I would suggest that you download and install the newest version of the HP Support Assistant which if you follow the HP Support document: Using HP Support Assistant (Windows 7) should get you all the newest drivers for your computer.
Please re-post if you have any further issues. Thank you for posting on the HP Forums. Have a great day!
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Unable to adjust screen brightness

i can see the logo on screen when i press f2 and f3 but the brightness do not changes .. all the other functions work like radio switch , audio adjust etc..
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Hi:
If you reinstalled or installed a different operating system you need to install the correct graphics driver in order to adjust the screen brightness.
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try change drivers
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How to change screen brightness on bootcamp 5.0.2 in Windows 8?

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I you not familar with Native Extensions and C++ / C - you can try avoid using it using already done external apps. Just find one that can work in background so users will not see it.
http://www.nelsonpires.com/software/dimmer/ go there and download simple app.
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Not an answer to your question, but anyway:
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MacBook 2GHz 2GB Mac OS X (10.4.8)

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-TP

LightScript - Lightweight script to easily change screen brightness.

Wiki: https://wiki.archlinux.org/index.php/LightScript
AUR: https://aur.archlinux.org/packages.php?ID=62997
Official site: http://haikarainen.dotgeek.org/lightscript/
My first package, be gentle
Created this script because of 3 reasons:
1. KDE's controller for backlight is really buggy for me, makes it unusable.
2. xbacklight does not work well with multiple controllers for the same device (I get 7 stages of resolution instead of 4882).
3. I like scripting/doing my own work.
What it does?
LightScript automatically detects the best backlight-controller based off its precision/resolution, and uses that controller to set the backlight to a value you specify in percent.
Example: "light 30" <- Set brightness to 30%
If sudo is installed, it will attempt to use this instead of forcing root (so you wont have to type "sudo light x" instead of just "light x").
It also has a default minimum-cap of 5%, since some controllers turn the display pitchblack on 0%. This behaviour can be overridden by changing /etc/lightscript/minlight
Updates:
Since version 0.3.6 the script now also takes + and - operators, so you can increase and decrease brightness instead of just giving a fixed value.
It also checks for filepermissions on controllers before deciding wether to force root/use sudo etc.
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0.3.6 also came with 2 small issues that is on my todolist; Firstly, typing "light +" or "light -" will give expr errors, nothing dangerous though. Secondly, the output on dynamic changes(with operators) might shift with 1-2% when mixed with regular changes. This is only what you see though, internally everything works fine, it will still write the correct values to the controllers.
Since version 0.3.5 the script has undergone huge internal changes (basically rewrote big parts of the script to make it more consistant and futuresafe, removed dependencies, gave a prettier output as well as more information etc)
Find any bugs? Have any feedback? Dont hesitate to reply
PS. I am aware that this might not be preferrable to most people (if xbacklight/other software they use works well), I just want to share my work with the community (especially since it is my first real bash script, also I get to practice AUR-packaging for upcoming c++-made-software!)
Last edited by Haikarainen (2012-10-01 17:50:18)

The script has been successfully ported to an ANSI C89-program!
Its commandline options is really different from lightscripts, but internally it works the same way. I've also added functionality per requests I've gotten, I'll let the programs output speak for itself:
fredrik@fredrik-arch ~/projects/light % ./light [20:07:53]
Usage: light [-qcas] <value>
-q: Run quiet, supresses output.
-c: Prints the current brightness in percent and exits.(Not precise)
-p: Prints the current brightness directly from controller and exits. (Precise)
-m: Prints the max brightness directly from controller and exits. (To be used side-by-side with -p)
-a: Add the value instead of setting it.
-s: Subtract the value instead of setting it.
<value> Brightness wanted in percent.
I'll package this under a different name tomorrow(since it's now a completely different product), stay tuned!

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Life as an Apple Switcher - http://aurora7795.blogspot.com

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HI
For my HP Pavilion 15-e017tx.
It was working fine till yesterday. But today when i tried to change screen brightness it wont change.
I did it from the special keys provided for it and also from the windows mobility center.
Tried to change the Power plan as well.
Restarting the system also didnt help.
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Try doing System Restore to a previous good state, at least 24-hours before the problem started:
http://h10025.www1.hp.com/ewfrf/wc/document?cc=uk&lc=en&docname=c03327545
OR
http://h10025.www1.hp.com/ewfrf/wc/document?cc=uk&lc=en&docname=c01867418
Thanks,
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Unable to change screen brightness

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