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Genie03
Paper Tape
Posts: 5
Registered: ‎08-17-2015
Location: Philippines
Views: 2,813
Message 1 of 6

Lenovo Z400 Brightness problem in Windows 10

Hi there guys, I updated my laptop to Windows 10 for like 2 months now. It works flawlessly except for one thing, I can't adjust the brightness of my monitor. My unit is Lenovo Z400 with intel core i3, intel hd 4000 graphic card with a dedicated gpu from nvidia (gt635m). Everytime I adjust the brightness, it turns down to 25%... So it means that my display will go from very bright to dim. All I need to do then is to restart my computer and as it boots, i will press the brightness key to bring it back to 100% brightness. It seems annoying sometimes becasue everytime I hit the brightness hardware button, this happens. So my question is, when are you going to update the drivers in your site or is there any way to make this work aside from using the Microsoft Basic Display adapter. Thanks in advance guys Smiley Happy

Retired Support Specialist
Posts: 734
Registered: ‎08-24-2015
Location: Egypt
Views: 2,766
Message 2 of 6

Re: Lenovo Z400 Brightness problem in Windows 10

Dear Genie,

 

Welcome in lenovo community,

 

Lenovo did not test or release the compatible windows 10 drivers for the Z400 laptop yet,

 

Please try to uninstall the graphics driver from the device manager >> restart the laptop >> right click the graphics driver in device manager >> Update Driver software >> Search automatically software.

 

Regards,

Joseph

 

 

Tsafos12
What's DOS?
Posts: 1
Registered: ‎09-07-2015
Location: New Jersey
Views: 2,752
Message 3 of 6

Re: Lenovo Z400 Brightness problem in Windows 10

I have the exact same problem with my P400. You have to reload the Old Driver or in Device manager under Video - Drivers you can "Rollback to to Previous Driver". This happens everytime Windows 10 does an Update which is Troublesome. Lenovo Never Fix this Problem from Windows 8.1. I keep asking Lenovo when will them fix the problem but no answers.

Genie03
Paper Tape
Posts: 5
Registered: ‎08-17-2015
Location: Philippines
Views: 2,740
Message 4 of 6

Re: Lenovo Z400 Brightness problem in Windows 10

Thanks Joseph for the quick response. I tried your solution but then same issue, it downloads the latest driver from  Intel but then again I can't adjust the brightness. Anyway, I found a solution to this temporarily by editing the registry. It worked though.

WilfMedweth
What's DOS?
Posts: 1
Registered: ‎10-15-2015
Location: Toronto
Views: 2,688
Message 5 of 6

Re: Lenovo Z400 Brightness problem in Windows 10

Genie03, would you please post the registry changes that restores the brightness control function...Thanks

Genie03
Paper Tape
Posts: 5
Registered: ‎08-17-2015
Location: Philippines
Views: 2,611
Message 6 of 6

Re: Lenovo Z400 Brightness problem in Windows 10

Hi there, here's what I did.
 
  1. downlad lastest driver on intel website
  2. run Regedit
  3. search[HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Class\{4d36e968-e325-11ce-bfc1-08002be10318}\0000] or [HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Class\{4d36e968-e325-11ce-bfc1-08002be10318}\0001]
  4. at paramiters "FeatureTestControl" insert dword:0000f048 the new path will be: [HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Class\{4d36e968-e325-11ce-bfc1-08002be10318}\0000] "FeatureTestControl"=dword:0000f048 or [HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Class\{4d36e968-e325-11ce-bfc1-08002be10318}\0001] "FeatureTestControl"=dword:0000f048
  5. reboot

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