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Lozzerdude
Not applicable
Posts: 9
Registered: ‎10-29-2015
Location: GB
Views: 487
Message 11 of 14

Re: Lenovo Z500 - Cannot adjust brightness in Windows 10, need fast help..

This is what worked for me.

  1. Press Windows key
  2. Type "regedit"
  3. Press F3 in regedit to open the search dialog box (or select "Edit" menu)
  4. Type "FeatureTestControl" (no quotes) then click "Find Next"
  5. Once FeatureTestControl is found right click it and select "Modify" (see image showing the edit dialog box)
  6. Replace the original value (F000) with F008. I only changed the value in the first place it found "FeatureTestControl"

FeatureTestControl.JPG

 

On my Ideapad Z500 this value now appears 3 places where FeaturetestControl can be found  as follows :

 

Computer\HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Class\{4d36e968-e325-11ce-bfc1-08002be10318}\0001 

Computer\HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Video\{8B6C0F89-70C1-11E8-AFC3-A8D8EC97F9F6}\0000 

Computer\HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Video\{8B6C0F89-70C1-11E8-AFC3-A8D8EC97F9F6}\0002

 

Its always a good plan to backup your registry before tinkering.

I hope that helps but please don't ask what it all means!

gh7401
Not applicable
Posts: 3
Registered: ‎04-10-2014
Location: DE
Views: 474
Message 12 of 14

Re: Lenovo Z500 - Cannot adjust brightness in Windows 10, need fast help..

tnx. Here I tried this one: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4d36e968-e325-11ce-bfc1-08002be10318}\0001 and changed the Value to f008. After years of trials the first positive hit.

Lozzerdude
Not applicable
Posts: 9
Registered: ‎10-29-2015
Location: GB
Views: 461
Message 13 of 14

Re: Lenovo Z500 - Cannot adjust brightness in Windows 10, need fast help..

Once you’re happy it’s a fix, could you mark it as an “Accepted Solution” as prompted earlier in the posts. Thanks
GoldFire5
Not applicable
Posts: 1
Registered: ‎06-06-2019
Location: HR
Views: 157
Message 14 of 14

Re: Lenovo Z500 - Cannot adjust brightness in Windows 10, need fast help..

Sorry maybe is late. I have that issue many time on 7,8,10. Just uninstall intel hd 4000 grap. from device manager under display  and chek box to delete all software after finish press yes to restart(dont ran any other programs).. After reboot( u can download before unintsal grap and u can download some intel servise assistant for update) https://downloadcenter.intel.com/product/81499/Intel-HD-Graphics-4000

Install intall driver and reboot  it worked for me every time, sometime i need to repet process. Sorry for bad. eng. I hope it will help you or someone else.  greeting. Smiley Happy

 

 

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