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I can't change iMac (2011) display brightness on bootcamp with Windows 7. When I press F1 it shows icon and even fill the bar, but nothing happen to display.

What have I tried:

  • Reinstalling support files
  • Installing fresh drivers from ATI site.
  • Changing screen brigtness in windows "Power Options".
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up vote 0 down vote accepted

I solved my problem, but I don't actually know what solved it:

  • I rebooted manualy without any third-party software like BootChamp.
  • I was pressing Alt (option) key when booted.
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