screen brightness stuck

Screen brightnes couldn't be adjusted in Fn keys or via Control Panel. It usually fixed if I shut it down and turn it on again, but the same method won't work now. Funnily, I can adjust it on BIOS setting before booting to Windows.

I'm currenly on Windows 8 pro, but I don't think it is the problem because last time it stucked in Windows 8 it still fixed with turn off method. I haven't manually installed the driver for my ATI Radeon 5850 since I upgraded into Windows 8, but it still play games as well as in Windows 7.

 

I believe that you need to install manually the video drivers, that could be the problem. If not, go back to Win7 which is officially supported.

 

AMD drivers have been notorious for brightness controls not working at various times. Some Catalyst packages never had brightness control. Try disabling driver signature enforcement in Windows 8 and reinstall the driver with that disabled. If it works you can re-enable driver signature enforcement is you feel compelled to do so. (Driver signature enforcement is unnecessary and I just leave it disabled as I do UAC... both are just an inconvenient annoyance.)

 

I have a 17x that is having the same problem. I installed the 12.11 beta drivers and afterwards could not adjust brightness anymore. Mr.Fox, can you link to a site or give a short crash course in how to disable signature enforcement?

 

Same problems on w8 with cat 12.9 and 12.11 beta. Although 12.8 worked to control it for me.


Open a command prompt as admin, hit win+x key and click it when on desktop.

bcdedit /set loadoptions ddisable_integrity_checks
bcdedit /set testsigning on

Reboot
Install driver

Admin command prompt again

bcdedit /deletevalue loadoptions
bcdedit /set testsigning off

 

You're using Windows 8. That's the problem. I spent most of my summer in the Beta, along with the trial version before official release. I'm back to 7, mainly because of all the compounding issues I was having with gaming/ and Alienware oriented stuff. I won't get into debates here, but it's definitely not an OS for a desktop or laptop. I found it awkward on my laptop to access things.

Anyway, there's very little support at the moment for our laptops. I'd wait a bit a couple of months before actually installing 8, but that's just me.

 

Sorry to re-open a dead thread, but thought its better then posting a new one.

Got this problem once I installed the Beta 13.3 AMD drivers on Windows 7 64Bit, the above steps worked, but once I reboot, the brightness option/ functionality is gone again, and I have to then re install the drivers. Seems to lose it every restart, any one else having the same issue?

 

For everyone having brightness issues here's how I fixed mine:

1) Uninstall all of your AMD drivers.

2) Get driversweeper or the new driver fusion(preferably since it's newer)

3) reboot

4) Use driver sweeper to clean out the AMD Display section. If it says there were a few files that couldn't be swept and you should look into the premium version, ignore it!

5) reboot

6) install the 13.1 whql mobility drivers (some say 13.2 broke brightness again)

7) reboot

8) enjoy brightness! =]

 

I am currently on 13.11 drivers and I also had no brightness control in windows 8.1. I finally found a working solution: