Windows 7: Can't Adjust Screen Brightness............HELP!

I have the same problem. I have a Toshiba M750 TabletPC. What I found a few days ago was an option in Windows 7 to enable the automatic screen brightness feature, and enabled it, thinking that it might help me when out in the field. However, when using the laptop undocked today, I found that I could not use the unit's built-in adjustments with the Fn key! I managed to override it my manually setting the screen brightness in Windows 7, but I'm afraid the default option of using the Fn key to adjust the screen is now disabled. I can't find the option what I enabled recently in Windows 7 - anywhere! Nor can I find any solution online, so don't know where it went. I'm also using Classic Shell to allow me to have a XP-type feel to things, so this might be preventing me from finding this option - I have no idea where to look now. Anyone know exactly where this might be? TIA!

me also having the same problem
i have windows 7 64 bit version
my laptop model is hp pavilion dv6 1152tx
i am unable to control the brightness with the fn key
as well as from the power option
there is no slider to change the brightness...
plz help me..

POSSIBLE SOLUTION that worked for me!!!

If you have installed teamviewer and the teamviewer's driver provided for your screen (that it is can be done from advanced settings in version 6) RESTORE IT to the previous monitor driver and it will work instantly!!!!

If you don't know if the driver is installed just locate the monitor in device manager. The teamviewer's driver is named teamviewer monitor driver or something like that... It was for me easy enough to understand the difference...
Well at this point just RESTORE PREVIOUS MONITOR DRIVER (NO UNISTALL) in 7 (or xp or vista)

For all others that DO NOT HAVE TEAMVIEWER installed I suggest to reinstall the ORIGINAL MONITOR DRIVERS and NOT DISPLAY DRIVERS CARDS brightness control seems to be depended from monitor drivers.

Please add the solutions that were found in topic start.

I have an Asus 1018p and I've been attempting to figure this out on this netbook for the better part of two months now. Finally figure it out, for me it was the Monitor driver, It was set as "Generic PnP Monitor", When it should have been set to "Generic non-PnP Monitor" I must have updated the video drivers on this thing a dozen times, and i knew it wasn't hardware related. Just thought i would share the fix that worked for me.

THANK YOU stsaerox -- I can finally use the laptop in the bedroom without waking up my wife!!!
I'm using Teamviewer7, and went to: Extras; Options; Advanced; Show advanced options; Advanced network settings; Uninstall monitor driver

If you're not using Teamviewer, as stsaerox suggested, go to Monitors in Device Manager. Double click on the monitor, go to the Driver tab, and try Roll Back driver. If that doesn't work you should be able to just uninstall it (right click on it and chose Uninstall)... And then Action, Scan for hardware changes. A generic monitor adapter should be found.
BTW, after uninstalling the TeamViewer adapter, mine now shows up as Generic PnP Monitor.

To fix the ASUS brightness on a desktop with an AMD Radeon HD6800 video card.
All Control Panels: Display : Devices and Printers:
Right click on ASUS monitor
Display Settings
Advanced Settings
Catalyst Control Center
Desktop Managementesktop Color
Now the Brightness/Contrast/Gamma can be adjusted

Hopefully other Video cards have a similar video control

I'm happy for helping you, seems like a real solution then. I should ask also teamviewer creators to fix this also,

BEAUTIFUL!

after probably 8 hours of reading online, looking for the solution, I found you! I wanted to thank you personally!!!