Following an upgrade to Windows 10 from Windows 7 on my Sony VAIO laptop, I have lost the ability to brighten the screen although controls indicate full brightness.
Any suggestions?
Following an upgrade to Windows 10 from Windows 7 on my Sony VAIO laptop, I have lost the ability to brighten the screen although controls indicate full brightness.
Any suggestions?
I had to edit the registry key Feature Test Control in
HKEY LOCAL MACHINE\SYSTEM\ControlSet001\Control\Class{4d36e968-e325-11ce-bfc1-08002be10318}\0000 (or 0001)
I set the value of FeatureTestControl
to 0x0000fb20 (64288). Screen brightness works fine now.
In addition to disabling "enable adaptive brightness" under advanced power settings in Control Panel you must also:
It happened on my friend's Vaio laptop but I managed to fix it by setting the auto-brightness setting to OFF. It seems that the Windows 10 update made the setting on a Vaio laptop revert back to default. So you need to turn auto-brightness off via your Vaio setting.
You probably need to reinstall the drivers specific to the VAIO that deal with the buttons/key presses specific to that model. Often Windows will not contain the vendor specific software required for some features found on that same vendors hardware.
As a concrete example, I have an HP NC4200. If I install a fresh copy of Windows 7 on it, then none of the Sound/Brightness/SD Card slots/Touchscreen/Video functions work "out of the box", and it is necessary to visit the HP website, look up my particular model and then download all of the drivers required. In my case, there were over ten addition separate drivers required.
So, I would advise you to visit the Sony website and look up your VAIO model and find the relevant drivers.
NOTE: It is possible that as Windows 10 is very new, Sony may not have updated their drivers yet. You could try reinstalling the Windows 7 drivers again, they may work. Or you may have to wait until a Windows 10 compatible set of drivers becomes available.
Another answer was added as an edit to my answer, by an anonymous user, which I have made a separate community wiki answer.