Screen light doesn't adjust

Hi,
my problem is that my screen light won't adjust.
I can see the light volume setting on the screen (thought it doesn't work normally: it usually stops going up or down after one click..) but the light level is always the same.
I tried the control panel too, but nothing worked.

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Hi @kolz,
Welcome to the HP Forums!
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i grasp that after updating your system from Windows 8 to 8.1 you are having an issue with the display going dim.
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Windows 8 an 8.1 are not supported Operating Systems for your notebook. This does not mean they will not work only that HP has not tested it and therefore does not supply updated drivers. You would need to check the manufacturer's site for any updated drivers.
Downloading or Updating Software and Drivers for HP Computers
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As a bios update does have a potential to cause damage I suggest contacting HP support for assistance with that process.
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In daily use: R60F, R500F, T61, T410
Collecting dust: T60
Enjoying retirement: A31p, T42p,
Non-ThinkPads: Panasonic CF-31 & CF-52, HP 8760W
Starting Thursday, 08/14/2014 I'll be away from the forums until further notice. Please do NOT send private messages since I won't be able to read them. Thank you.

Screen light doesn't adjust

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