Display brightness not working on Win8 / m6600

hi

i've upgraded my m6600 to Windows 8 (MSDN). everything works perfectly - except for the display brightness... (even the Keyboard backlight brightness hotkey works fine...).

i cant' control the brightness with hotkeys or the slider in power Settings.

i've tried (also reinstalled) the original dell win7 x64 Drivers and right now i'm running the nvidia win8 beta and Intel graphics beta Drivers - no crashes or issues.

anyone has a solution or the same Problem? do we have to wait for updated dell Drivers? any anouncement yet?

thanks for your help!

 

Not running win8 but I would always have that problem if I used Intels hd3000 drivers instead of the Dell ones.