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I have a Sony Vaio with Windows 8 and the brightness is at the minimum level all the time. If I increase it with Fn+F6 it immediately reverts back to minimum. I am not sure what to do next. I have tried control panel, power options and changing it directly there, but I get the same result.

What would cause this? How can I fix brightness to be adjustable to my needs.

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Most likely happening due to the Windows 8 "adaptive brightness" option being enabled.

Follow these instructions to disable it (the link includes screenshots]:

  • Open up the Windows desktop with Win+D, click the power management icon in the tray, and then choose More power options from the menu.

    Note that you could also use the Metro search screen to get to the Power Options panel.

  • Once here, click the “Change plan settings” link on the selected plan.

  • Then click the “Change advanced power settings” link.

  • And now, browse down to Display –> Enable adaptive brightness, and change the settings there to Off.

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I had the same problem with my old Sony Vaio. The problem is something wrong with Windows 8 drivers (It happens to Windows 10 as well). But no new drivers avaiable for this old models.

The solution I found (after digging quite long in Google) is not so complicated:

  1. Open Regedit.exe
  2. Find this key:

    \HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Class \{4d36e968-e325-11ce-bfc1-08002be10318}\0001 (or 0000)

  3. Look for this key: "FeatureTestControl"

  4. Change its value to:

    • "fb20" (hexadecimal value) if you have integrated Intel Graphics or
    • "fb60" if you have a NVIDIA Graphics card.
  5. Restart Windows

PS: Its wise to make backup of your registry before making any change.

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