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dzejkoboo
Paper Tape
Posts: 3
Registered: ‎11-19-2018
Location: US
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Message 1 of 13

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

Hello,

Laptop which is facing the problem, is Lenovo Z500.

Windows 10.

A problem that is known, but I can not deal with it.

I installed 5 different drivers for the integrated graphics card, changed the parameter in the register FeatureTestControl parameter to FFFF, I installed various energy management. I changed the HD4000 driver to the basic one from Microsoft.

Nothing helps - when clicking the dash / dimming, a bar appears, which moves as it should, but the screen is still the same dark.

As I enter the settings -> screen, and there I set the slider, strange things happen, the screen goes self-darkening, dims itself, literally as if the laptop had a light intensity sensor ..

The BIOS can be used to light up the screen, it shines as it should, it does not get dark, etc. The matrix is okay.

Anyone have any suggestions on what you can do here?

Actually, for me, brightness can be 100% all the time, but the way with FFFF in the registry does not help.

Social Support Agent
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Posts: 419
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Location: US
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Message 2 of 13

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

Hi dzejkoboo!

 

Welcome to the Community,

 

May we know how did you get Windows 10 in your laptop? Upon checking, the Lenovo Z500 is not compatible with Windows 10,

 

https://support.lenovo.com/sk/en/solutions/ht103535

 

Expect that there will be compatibility issue if this is the case.

 

Regards,

 

Admin note: link shortener converted to full URL for clarity



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gh7401
Paper Tape
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Message 3 of 13

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

During boot you may quickly adjust the brightness. When bot Process is finished and contol passed to Windows, never again touch brightness up or down. This causes screen to almost darkness.

Retired Support Specialist
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Message 4 of 13

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

Hi! What's the default OS of your machine? We cannot provide Windows 10 drivers as it's not supported yet on this machine. Try to disable Adaptive Brightness. Go to > Power Options > Change plan settings > Change advanced power settings > Display > Disable Adaptive Brightness.



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dzejkoboo
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Message 5 of 13

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

Ive installed Win 8.1
Same thing happens.. after all of this mentioned above drivers and register (FFFF) stuff

Retired Support Specialist
Posts: 156
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Message 6 of 13

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

Have you tried disabling the Adaptive Brightness?



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dzejkoboo
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Message 7 of 13

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

Yep, still nothing.

Social Support Agent
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Message 8 of 13

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

It would be best for us to bring the laptop back to it's original OS. This is one way for us to isolate the problem. Might as well download the drivers for Windows 8.1 once done, and observe for any changes,

 

https://pcsupport.lenovo.com/us/en/products/laptops-and-netbooks/ideapad-z-series-laptops/ideapad-z5...

 

Regards,



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Lozzerdude
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Message 9 of 13

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

I have had this probem since upgrading to Windows 10.

Lenovo say that this Model is not suited to Windows 10 but it can be made to work if you are prepared to iron out any issues.

The brightness control problem can be fixed by re-installing the original driver for the HD4000 graphics.

The original set-up is stored on the D drive ready for a restore.

To save time reloading the original driver, a shortcut can be set up on your desktop to the setup file.

This is the path, which should be the same if you have a Lenovo Ideapad  Z500

 

D:\drivers\VGA\Intel\x64\9.17.10.2867\Setup.exe

 

Go through this install procedure every time Windows updates the video driver and part way through the install the brightness restores.

 

Breaking News

The above fix only lasts until Windows 10 decides to check for updates and automatically replaced the outdated HD4000 driver for the latest version. Unfortunately, neither Lenovo nor Intel seem to have any interest in fixing this bug in the current drivers.

So the problem comes back.

 

I had tried the Registry fix referred to other posts, changing the hex data for FeatureTest Control from "F000" to "FFFF". This didn't work for me.

However, just this week (Mon 28 Jan 2019) I read a similar post about a different Model of Lenovo laptop.

This user changed the hex data to "F008" and it had fixed the problem.

I tried this and it worked a treat (I have no idea what this does or why it works)

 

My Lenovo Z500 now has the latest version of Windows 10 with the latest version of the HD4000 video driver  and the brightness control using Fn + F11/F12 works perfectly.

I have no idea whether this fix might fail with the next update of the video driver but at least its working now.

Take care when you change the registry.

gh7401
Paper Tape
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Registered: ‎04-10-2014
Location: DE
Views: 805
Message 10 of 13

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

Please be so kind as to tell us the changed Key in registry. Control\Class or Control\Video? Here I got  Value: 0x0000F000. TNX.

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