Screen brightness adjustment broken

Since the latest updates to the kernel/udev/kmod, I can no longer control my screen brightness via KDE. This used to work perfectly. Neither the Fn-F6/F7 key combination, nor the "Screen Brightness" slider on the KDE power management tool changes the brightness.
Is this a known issue? If so, is there a workaround...?
I use a Toshiba A500 laptop. Like I mentioned, this worked last week, before I ran pacman -Syu :-(
The real problem is that it seems stuck at the highest brightness - this is draining my battery within 20 minutes.
Is there another way to adjust the screen brightness?
Last edited by twelveeighty (2012-01-24 05:14:38)

what is your gfx card,  don't know this model.
For NVIDIA I had to add the following to /etc/X11/xorg.conf.d/15-nvidia.conf
Option "RegistryDwords" "EnableBrightnessControl=1"               
So now it reads:
Section "Device"                                                                                                                                                                       
        Identifier     "Device0"                                                                                                                                                       
        Driver         "nvidia"                                                                                                                                                       
        VendorName     "NVIDIA Corporation"                                                                                                                                           
        Option "RegistryDwords" "EnableBrightnessControl=1"                                                                                                                           
        # Option "RandRRotation" "true"                                                                                                                                               
        Option "NoLogo"        "true"                                                                                                                                                 
        Option "Coolbits"      "1"                                                                                                                                                     
        Option "TripleBuffer"  "True"                                                                                                                                                 
        # Option "DamageEvents"  "True"                                                                                                                                               
        # Option  "UseEvents"    "True"                                                                                                                                               
        # Option "BackingStore" "True"                                                                                                                                                 
        Option "DPMS" "True"                                                                                                                                                           
        # Option "RegistryDwords" "PerfLevelSrc=0x3333"                                                                                                                               
EndSection

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