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sunantawu
Paper Tape
Posts: 5
Registered: ‎01-13-2014
Location: ID
Views: 497
Message 31 of 32

Re: Lenovo Z400 touch Brightness Problem in Windows 10

Hi, I have the same problem.

I have a question, after you fixed the brightness issue, do you have problem with projecting to other screen? (using VGA port or HDMI port) ?

 

because in my case, if I fixed the brightness problem (by roll-back driver) then I can not project to other screen.

 

please let me know

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EltonSilva
What's DOS?
Posts: 1
Registered: ‎12-16-2018
Location: BR
Views: 261
Message 32 of 32

Re: Lenovo Z400 touch Brightness Problem in Windows 10

Hi,

 

Here goes a little update

After upgrading Windows 10 to each new version (170x and 180x) the problem comes back.

Recently, Microsoft changed the location of the FeatureTestControl key. Now it is located in: 

 

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Video\{C6A0EC52-FFDC-11E8-B008-A61253645DE3}\000X

 

The key FeatureTestControl must be to hex value "f048"

 

In my z400, I've found 3 keys (0000, 0001 and 0002). When I changed the first, the others were changed too. It's always good check it.

 

After reboot, the brigthness buttons were working fine

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